Well unfortunately there are no diet pills that have been proven to work.
I can understand your frustration as when i was in high school I ate minimally and exercised 2 hours a day and had trouble dropping weight. Now I weigh less than I did in high school and I exercise moderately and eat fairly well. Have you been doing some form of exercise every day? Have you been counting your calories? There is a lot of support on these forums so I wish you the best in whatever you do