Ready to throw in the towel...

Are you eating enough? Eating back at least some of your exercise calories?
Drinking enough water?
I bet you will find you have lost inchs even if the scales have not moved. I have read a lot of posts like this and it does seem to be the case. Did you take your measurements when you started at all?

With regards to WW, why don't you try following the WW plan at home but logging it into MFP to see if this helps?

Maybe you've just hit a plateau. I just ended 3 weeks of no weight loss and hoping it's heading down again. Don't get discouraged. Weight watchers is counting calories they just do it for you.

you really can't give up -- it's all about changes all together
EVERYONE gets stuck at some point and some more than others
hang in there and ensure you are eating every 2-3 hours something and if you are doing P90X it may be that muscle is coming about ---

remember calories are one thing but inches are another and sometimes us women don't eat enough and especially don't drink enough

look up the fullbar -- this guys has it all figured out and he is a gastric bypass dr. that would rather teach us how to fix our issues and save the surgery for those that really really need it

good luck

Why did you leave WW? Just wondering if you had these struggles before using mfp
Maybe you are not calculating foods properly? WW, MFP and any other system uses the same calculations. Burn more hten you eat. you could be in a plateau. These are the hardest times to get through. Push through, adjust something. Maybe some good old fashion rest

Throwing in the towel gets you nowhere. Those last 10 pounds are the slowest to come off. I am assuming that weighing 120 is a healthy weight for you according to your height. Exercising is good for your heart and lungs; it is more than about weight loss, it is about LIFE GAINED! Use whichever food program works best for you (I have heard nothing but good things about weight watchers who use that format), but consider this a lifestyle and don't do something just for the sake of losing weight that you are not going to be able to sustain as your new lifestyle. Good luck and don't give up!

Don't throw in the towel just yet. I am pretty much in a like situation. I started Insanity about 3 weeks ago. MFP has me at 1200 cals. I've lost about 16-17lbs but have been struggling with the last 5lbs...so I thought Insanity might help and tone me up. I'd do just fine at 1200 cals (eating back my exercise cals too) but by the 3rd day or so I'd be ravenous and would end up snacking all afternoon. I went to the Beach Body site and used the nutrition calc and it said I should be eating 1900cals...yikes! I ended up signing up there (the free subscription) and was contacted by a coach. I asked him what I should be eating and he agreed it should be 1800-1900 cals. I've put on 3lbs...but have noticed some toning. I'm trying not to FREAK since the scale is moving in the wrong direction. I try to remind myself my clothes are still fitting the same. I'm trying to work on getting my nutrition back on track. Amazing how some poor decisions bring out my sugar cravings in full force! You might want to increase your cals a little bit...last night I burned 500cals in just over 40 minutes. I've never done P90X so I'm not sure how it compares to Insanity. Have you noticed some new or toned muscles? As I understand it, muscle burns fuel more effieciently and you need more to keep going. Hope this helps and keep up the great work!

Ok I am real close to giving up with using MFP and excersising altogether.

I lost 75 lbs on WEight watchers with barely any excercise. I've been counting calories for about 3.5 weeks now AND doing P90 and have not lost anything. I may have lost one but then gained. I am stuck at 130 and can't get past it. My goal weight is 120.

I am currently eating roughly 1350 calories per day. I don't know what I am burning with my p90 cause I do not have a HRM.

What is the problem? Should I go back to WW??

Read this thread:

http://www.myfitnesspal.com/topics/show/113609-relatively-light-people-trying-to-get-leaner

For someone at your level assessing your progress simply using the scale is meaningless. Let me ask you this: if the weight on the scale went down but you gained fat and therefore looked fatter (indicating loss of muscle / lean mass) would you be more or less happy?

As I suspect body recomposition / sculpting is really your goal not arbitary weight loss. The scale simply won't reflect that in isolation. You could go back to WW, you could stick here, but I doubt either would really bring you happiness in the long term as you haven't really learned what is going on with your body or how it works. I don't know you but I can tell you one thing with absolute certainty. Your body is more amazing than you ever could imagine....

Now is the time to focus on fitness goals, to get out your soft measuring tape, to assess using photos, BF % AND the scale.

Ok I am real close to giving up with using MFP and excersising altogether.

I lost 75 lbs on WEight watchers with barely any excercise. I've been counting calories for about 3.5 weeks now AND doing P90 and have not lost anything. I may have lost one but then gained. I am stuck at 130 and can't get past it. My goal weight is 120.

I am currently eating roughly 1350 calories per day. I don't know what I am burning with my p90 cause I do not have a HRM.

What is the problem? Should I go back to WW??

As a man 1350 is not enough, you should not go below 1500 Net. You are not losing weight as you are doing intense exercise on very little fuel. change your goal to 1500 and estimate calories burned by entering circuit training into the exercise section and eat the 1500 and the cals you burned doing exercise. MFP works if you do it correctly, which at this point you are not following the program.

With very lettle left to lsoe you should set your goal at 0.5lbs/week anymore and you risk losing muscle, not just fat.

DON'T GIVE UP, I USE WW AND MYFP. I POST WHAT I EAT ON MYFP AND IT HELPS ME KEEP UP WITH HOW LONG I HAVE BEEN DOING THE PLAN. YOU CAN DO BOTH. ALSO KEEP EXCERCISING EVEN IF YOU ARE DOING WW, YOU LOSE MUCH FASTER.

Going from no exercise to P90 is going to add muscle and your scale will most likely go up. It's a good thing if that happens. It would be better to track percent body fat at this point in time along with upping your calories.