I cant stick to my diet, should i try diet pills?

heey! ahh i can never stick to my diet. i try to be healthy then always end up going to the junk food. im alwaaaaays eating i never feel full an di have noo idea whyy ! i weigh 110 right now and im 16. my face has gotten alot chubbier in my opinion and i really dont wanna gain anymore, but idk whats wrong with me i just keep eating eating eating ! , i used to eat fine last year. just three small meals and im full n ready to go. wtf ddo i do , i dont wanna gain anymore, i gurantee ive gaine more then 110 now, last time i checked was 2 wweeks ago. shud i try diet pills? do they really work? and what are the side effects. PLEASE dont tell me to be happy with who i am etc cuz i amm ! i just wanna loose a few pounds cuz it makes me feel better about myself and idk what other options i have cuz i cant stick with my dieting, and yes i do excersuze i go to the gym 3 times a week.