Maybe a push??

Wondering, well I KNOW to lose weight its mostly all about in the kitchen...I have NO idea what to eat (the duh, junk, sugars, processed crap, sodas, etc.) but I have no clue what to eat (I do but don't) or rather how much, portion size may be the issue?? I'm just having trouble in that area.....I do workout, I currently am doing the 30 day shred....
what's funny is that I've lost weight before, 162lbs to 135lbs, and maintained my 135 up until I got my new job and gained back to currently weigh 150lbs...I stupidly didn't chart my previous efforts, and I want to keep this weight off, so I need to get this into high gear.
Serious answers please, I don't need to be made felt worse then what I am. I am trying, but I'm wondering if there is anyone else that has been through this and could give some advice. Please!
Maybe I eat to little? I eat 3 meals, kind of...and to eat up to 5 meals/snacks a day...what qualifies as a snack? and is it enough for a snack...trying really hard to understand this, because like I said, I did it before and I'm doing the same things I did before, its just not doing the job. ...which is some sort of results, not even so much on the scale, but in inches and clothing fitting loser.