Hello i have a lot of pimples from 3 years and most of them hard turned into dark spots , how do i treat them to fade them and also what do i do to get rid of pimples?

Manage your acne: You're almost an adult. If two weeks on as much benzoyl peroxide or retinoic acid as you can tolerate hasn't gotten you a satisfactory result, get with your personal physician who can add medicine to manage your acne as should have been done when it started. Don't try to figure out why you have acne. It's nothing you did. They'll fade over months as you clear up. Best wishes.