mmm.. anal sex is.. amazing, if you prep right, use lube, and go slow. it kind of makes me sad that a lot of other girls don't like it, but then again, there are lots of stupid boys who just try to shove their dicks in, no prep, no lube (saliva from rimming or otherwise), no nothing, hurting the girl and probably turning her off anal for the rest of her life. my first experience was similar, i was with a bigger guy, and he just went for it, hurt like bloody hell. but the thought of it still turned me on, and the next time i tried it i was with another girl. she prepped me right and went slowly, made sure i was turned on and comfortable, and by the time things got going and the toys came out, i enjoyed it so much i couldn't stop myself from moving my hips and pushing back into her.
i saw a lot of people saying that anal is more painful than vaginal (not that vaginal sex is anything but bliss after the first time), but it doesn't have to be! if its painful, you're going too quickly and not using enough lube. making sure your bowels are for the most part, empty, significantly helps with that feeling "oh shit, i'm losing control!" anal is, well, anal, though, and sometimes it gets messy... doesn't always happen, but you shouldn't be surprised if it does - you are getting fucked in the ass, you know! :3