How to remove and prevent pimples?

Im 15 male. I have a lot of pimples. I use the Nivea for men 10x whitener, cleanser, facial wash, etc in 1. And from time to time I also use master cool and fresh facial cleanser because using it regularly will burn my face because I have sensitive skin. I pop my pimples' puss out before I wash my face during shower. although I do these I still get more pimples. More dark spots from pimples. Etc. How do I finally remove these pimples? And how do I prevent more pimples to come?