i didn't start drinking coffee when my friends did (around high school) because it tasted like shit. then in college during my first holiday sharing a place with my friends i noticed how they were all in a terrible mood before their first coffee, and i was sure i didn't want to get addicted like them.
i only feel sleepy if i am doing something very boring, so i know i don't need it.
as for energy drinks, i only had them twice, first time it was red bull and it did nothing for me, the second it was Burn after a night of hard drinking and less than 3 hours of sleep and it worked like a charm. i keep hearing horrible things about them, though, so i try to keep consumption to a minimum. this to answer EdgeOfForever.