How to get rid of KP on back arms and face?

After years and years and one year of high school I noticed how much I HATE my kp right now its bugging me. I see people with silky arms and idt about hair or anything but this kp is driving my head up the walll.... I hate that all these girls can wear tank tops to school and i cant cause of it.. and i want a nice smooth face too... PLEASE HELP ME. Im gettting desperate