I've never been bitten by anything other than a garter snake, but by god I've come intentionally close to being bitten by both cottonmouths and copperheads when I was a kid.
My brother and I would hunt snakes (and pretty much everything else we could) when we were kids. I shot a couple of each with a bow and arrow (it took a while), we'd find and collect the young garters (to play with) and we'd occasionally get bitten by the adult ones (while playing with, or trying to kill, them). Garters would sting a bit when they'd sting, but not even as bad as a wasp or a bad scrape, so it was mostly just fun and games for us.
My uncle has had a cottonmouth swim up his pants while he was swimming in the lake as a kid. My grandfather nailed a copperhead with a pistol, mid-strike, when he was walking with my mother (who was then a small child) in the woods.
I stopped hunting snakes when I was in 3rd grade. I saw what I thought (at the time) to be a garter snake making it's way for a large drainage pipe at the end of a culvert. I went after it with a flashlight and a heavy stick. When I was about half way into the pipe, the light shone on the snake (a cottonmouth), coiled about two feet from me, looking agitated and ready to strike. I very, very slowly backed out.
I later looked them up after finding out one of the kids in the neighborhood had died a couple years previously to a snake bite in the very same area as where we'd been hunting. That cured me quickly.
I've since stumbled upon a handful of rattlesnakes; I hate snakes, and if there is a hell, there are certainly snakes there.