Hey man, I was in the same boat as you a few years ago. Graduated high school at 120 lbs, went to college and found the weight room. The best thing about starting skinny, is that you're NOT going to get fat from working out, and the muscle you put on looks huge. I'm 5'8 165 now and I think I have the (not to sound ****y, but...)perfect guy body. You'll get there through hard work and lots of food. Go to IronAddicts.com and check out there routines. Also look through some on here. Hard work will get u where u want to go.