Muscle building pills, solutions, etc?

Okay so I'm 16 and I weigh 150. I'm not fat but I don't have a lot of muscle. This summer I'm going to run 4 or 5 times a week and I'm going to do sit-ups and push-ups everyday. I am also going to start benching every other day. And I'm going to try to eat healthier. I was wondering if while I am doing this, if there is a muscle building pill or something you mix in a drink that would help me build muscle faster while I'm working out. Maybe something from GNC or something like that. Please help me out and let me know. Thanks!