should I keep lifting heavy?

1. The answer to that question is "yes". ALWAYS, "yes".

2. You've "been told" you are getting too muscular? Why do you care what others think of you? Do YOU think you are too muscular, or are you pleased with your results? Do this for YOU, screw everyone else.

3. If you are eating at a deficit, you WILL lose weight while lifting heavy weights. It is completely impossible to build muscle tissue while eating fewer calories than you burn.

4. Do not do lighter weights. They will be ineffective in fat loss.

I don't really think you are getting "too muscular" whatever that means. You might post your routine for people to critique, but everyone here will probably tell you to continue to do strength training as well as the cardio to maintain muscle mass while losing weight.
Mike

If you can't seem to lose the fat, you're not in a calorie deficit. How much are you eating?
I am about 5'6, Started at 155 pounds, and now I weigh 132. I lost all my weight while lifting heavy, minimal (almost no) cardio, You definitely CAN lose while lifting, it's all about nutrition.

Without pics, I cannot say for sure but at your age and eating at a deficit, I seriously doubt that you are getting too muscular - building muscle requires a lot for men (no offense, but women do not have the testosterone levels - naturally - to become bulky like a man)... If you have a significant fat store, that may be being misinterpreted as too muscular... Make sure you are eating at a deficit and go ahead and lift heavy... You should have no problems... Remember, it is EASY to lose too much muscle so if you don't like what you see when you get leaned up some, just stop working that muscle for a little while and watch it atrophy right back to a desirable range.

She could very well be getting 'too muscular' if she's eating at a surplus. She hasn't mentioned eating at a deficit.

If you can't seem to lose the fat, you're not in a calorie deficit. How much are you eating?
I am about 5'6, Started at 155 pounds, and now I weigh 132. I lost all my weight while lifting heavy, minimal (almost no) cardio, You definitely CAN lose while lifting, it's all about nutrition.

Because it's worth saying twice. Losing fat happens in the kitchen (or staying out of it, rather, lol) Looking good naked happens in the gym!

Worth saying WAY more than twice!

I cant seem to loose the fat but I am gaining muscle. Should I just increase my cardio? I usually just do 30 min cardio and lift for the rest of my workout. Pleaseeee any advice?

1. Sort your diet out - it's not likely you are in a deficit
2. Add moderate amounts cardio if you like as an insurance policy against over eating or you feel better with a higher calorie intake. It's not otherwise necessary
3. If you like lifting heavy (what rep range do you exactly mean by that?) then continue to do it. If you want to try a higher rep range that it also be fine as long as you ensure sufficient load - ie the last few reps should be challenging to perform with good form.

If you're eating at a deficit then at best you'll build a small amount of muscle but it will show more because the fat is "subsiding". As one MFP said, think of your muscles as islands surrounded by water (fat). As the sea level drops, the islands look bigger.

If you're eating above your TDEE then you will grow muscle and fat.

Hec yes you should keep lifting heavy! I'm kind of in the same boat. Always been muscular with a (more than) healthy layer of fat over it all and I just started lifting maybe 6 months ago. I have trimmed down some but I'm never going to have a "lean" body type. Keep doing what your doing girl! I love seeing those women at the gym who don't have that typical fit body type but are beasting out heavy weights. Just do you!

who told you that you were getting too muscular?

do YOU think you're too muscular?

This.

And a deficit = weight loss regardless of lifting.