Why does caffeine or anything else not effect me?

Im a 17 year old bodybuilder,healthy not depressed or anything. (added that there cause someone answered the question and said it was cause they`re depressed) but I can drink any kind of caffeine or coffee and it does nothing to me..I dont get any kind of buzz and I never have it so I havent built any kind of tolerance..I have tried Redline which is supposed to be super potent and some lower brands, even the workout pills I try that contain nitric oxide for a super pump dont do anything at all to me..could anyone tell me why?