Mel, I was exactly the same. Actually, when I was about 20 the Dentist I attended at the time told me that my wisdom teeth would give me trouble. I actually have a small mouth and he knew they'd have trouble coming out properly. He advised me to get them out at the time (because you're young blah blah blah), but sure they weren't giving me any trouble, so I didn't bother.
I had trouble with them on and off all through my 20's. Particularly when I was stressed, for some strange reason. They started to really bother me in the last year or so and I left it too long to get this one taken out, that's why it broke. It had weakened so much. The rest of my teeth are all good, except those around the wisdom teeth. My Dentist was explaining that because they are decaying (because they can't come up properly) they risk decaying the teeth around them. Actually, when I get these out I have to go back and get two fillings around the teeth beside my two of my wisdom teeth.
I wish I'd listened when I was 20