How to prevent pimples ?

OMg i need help wth my acne . ive tried many many things & they hvent worked . Am 13 & i hate havinq pimples . I feel bad cus most of my friends dont have acne like i do , soo i really dont have someone to help me . i try one product for like 2 weeks & i see noo results & i qo for another product . But then i feel fustrated and dont use nuthinq for a while . I HATE lookinq straight to a quys face cus am scared the would say sumethinq about it . i would juss like to clear up my facee too be HAPPY for once in a lonq timee . i would like to start high school with a clearer face . I NEED HELP . PLEASEE HELP . . .THANKSS