How to control MY life?

im 15, a sopre at high school, and all thru my years in high school so far, and middle school. ive tried and dropped out of a LOT of activities because of what people were saying/doing to me. I dropped outta Chorus in 6th grade because people were calling me "chior man" and some other bad stuff. i dropped outta a club in 7th grade....due to harrment, and i started guitar in 8th grade (my life long dream was to play guitar) i stoped playing 4 months after starting because people at school were saying stuff like "you'll never be able to play" and "your guitar sucks" (its a Fender Strat) Ive given up almost everything to stop this, but i want to be in crontrol of My life, not the rest of the at my school. What now?