What should I do to make myself feel better?

im a student , everyday it seems my confidence lvl goes down because im so skinny..
a take centrum or the multivitamins that I think would help me get fat..but it seems not..im still thin...they say I must do it with exercise...but what kind of exercises?...im in college...and for me ..im lucky if I can eat twice a day and sleep 9 hrs...what should I do...help please...thank you

You need to eat more. im going to try to find you a usefull site to help with this. xx