My Dad had a similar problem and had to have ALL his teeth removed at 25. I have beaten him on that score anyway so maybe you will beat it too!
My friend's sister never got adult teeth, she just has milkteeth and had to have false teeth from the age of 10! She's about 26 now and just had an operation to get some bone from her hip to rebuild her jaw and get permanent false teeth, yuck!
See, feel better now Casey? BeckyT/Rachel would be a good person to discuss this with since she is a pro at teeth!