Thanks a lot Apathy and Nick. I'll be looking into Krav Maga or jiujitsu or muay thai in my area, but I'm not sure I'll find any places that offer them. I think what I didn't like about Taekwondo was the flashiness. It's not even that flashy, but I didn't see the use of lots of the stuff I was taught (I guess that's more just the instructor's fault though). I'm going to stay away from sport or competition type martial arts. I liked the idea of judo but whenever I look at it I always think "but nobody wears clothes like that! Not all collars are sturdy enough to throw someone by". I'm going to start off with just whatever's cheap and convenient to build up some muscle, and then I'll look into something more specific like Krav maga or jiujitsu.
Nick: I live in canada

Not as good a selection as where you live, I imagine. I want to ask if you know anything about brazilian jiujitsu. There's a place that offers it, and I'm wondering if it's very different from regular old jiujitsu (which is what I think I want to start doing if I can)
And I totally don't mind being used as a punching bag. I can tolerate a good deal of pain. One of the things that annoyed me when I was doing TKD was that I couldn't ever actually have a good match with anybody because nobody wants to hit a girl

I get it, and I mean, obviously I don't encourage people to go around beating women up, but come on this is a sparring match and I'm wearing protective gear. Come at me, bro.
Someone mentioned training martial arts for self defense purposes. I''m interested to know if any of you have actually been in a situation where you had to use your martial skills to defend yourself, or do you only think that you will probably use them?
I don't have any skills but I've definitely used the super basic and easy stuff like how to get someone to let go of your wrist or your hair. Very helpful, I recommend a basic self-defense class.
I don't have any fighting skills, but somehow I seem to sometimes get caught in the crossfire of other people's fights. Last year I somehow ended up stuck between a guy with a knife and another guy with a plank of wood with nails in it (they were fighting each other, I was just a bystander who happened to get backed into the same corner as the guy with the plank, with the knife guy closing in on plank guy). I asked the knife guy to walk away, because my friend and I would get hurt if they were to continue their fight in this area that we couldn't escape, and knife guy eventually left. I think that was pretty lucky though, knife guy seemed high. I realize that martial skills would not exactly help me in that situation, but that was the second time in 3 weeks that I got caught in the crosshairs other people's fights. I'd probably just feel safer with some skills.