Re: My chest area..
Yeah once you are through growing you will fill out. When I started college at 18 I was 5'10", and weighed 130 lbs. Guys used to tease me all through high school and call me toothpick man because I was so skinny. By the time I was 24, I weighed 165 lbs which is about normal for a guy my height.
You might try weightlifting. I started lifting while in college because my roommate needed a lifting partner, and I went from looking like a wimp to looking like the jocks who used to pick on me.