Very shy kid here. Need some assistance from the Yahoo community.?

15 years of age right now and I am skinny but not very muscular. I started going to Bally's with my pops but he can only go about 2-3 days a week because he is usually busy. I am also kind of chubby on my cheeks and my butt and thigh is more muscular than my face because I do frog squats. I consider myself a disgrace because I was born in a spanish country the (dominican republic) but I don't speak it well. I like these girls in my school but I am very shy and I think they know it. I think that they don't give a **** about whatever I do and I feel like they talk crap when I am not around. Call me a pussy but I am scared to ask as I am not man enough to step up my game and ask her out and I am scared that I might get rejected. One positive thing is that it is like my entire class looks at me as a positive example as I am very smart in class but when my teacher asks me questions but something, I know the answer but it is as if I have stage fright. What should I do to be less shy? How about the work out? What should I do to get more biceps? As for nutrition what is really good food to eat? The 2 cereals I eat is golean crunch which I started eating recently and Swiss Muesli which has oat and raisins. In school they have mostly pizza and bad food. Bagel good with cream cheese? As for dinner what is good for that? I drink alot of water and my urine is usually white unless I drink soda. Please help me out. I don't wanna be shy anymore. It is like people think I am a nerd and I have no life whatsover.