The thing is though, I doubt any girls in college are going to want a 5'5 128LB guy that looks like their little brother. That's where my problem lies right there. I don't look like a "man", I look like a kid. I'm insecure and extremely shy so that lowers my chances as well. I try not to dwell on it and live my life, but I can't. My 14 year old brother who's a freshman looks like my older brother. He's bigger, he's an athlete, and guess what he has no problems getting girls. I can't put on weight, I eat and eat and eat. Still 128lbs.
Your looks dont matter you just have to say: fuck it, and increase your confidence by being ok with yourself, girls love that.
Edit:
Lmfao you have a little less height than me but the same weight, cheer up dude.