Why can't i lose weight?!? please make suggestions?

i have been eating yucky vegetables except corn b/c i detest it... i have been swimming for 40-45 minutes a day, i also use the wii fit aerobics for an hour, and im in weight watchers so i am eating no more than i am supposed to.... i am 14 years old, and puerto rican, i am 5'3 and i am 30-35 pounds over weight..... i weight 170 and its supposed to be 140 the healthy weight or somewhere there.... please make any suggestions and any wild tricks that made you lose weight..... i feel like a total outcast at my school, i live in ohio i dont mean this offensively or anything but im the only hispanic or colored student at my school and not only am i a different color i am also over weight please help me i would greatly appreciate it! :)