My Tan Won't Fade Away?

I am white, like pretty pale, but since i have been tanning since i was about four, my forearms upper knees, and thighs are tanner than the rest of my body and they never fade! wth? personally i like pale skin cuz it matches me better but it looks weird cuz when i wear shorts my skin is darker than them. theyre the light jeans. anyway it looks etarded. I have been trying to get this tan to fade for like a year, it hasnt. what do i do?