I got mine done at 26. Many drs were shocked that I was done at that age. And at 30, my marriage broke down and at 31 I had it reversed (unsuccessfully).

There is a very good reason why they don't let you do it at that age. It's because the reproductive urge in women can be very strong, and in your 20s, you still have LOTS of life ahead of you, even if you don't seen to believe it possible right now. Your circumstances change, your mentality changes, you will not be the same person at 30 that you were at 20, or even 25. I did not imagine myself with 4 kids in my 20s. I now have 4 and would have had more if I could have.

There are LOTS of ways to prevent pregnancy. I know you don't want to hear it right now but I would hate not to say anything and have you go through what I did. How many times in your life have you made a decision that you were SURE you would never regret but then regretted? Coz this would be a BIG one if you suddenly feel that niggling urge in 10 years when you're making more money, or when the medical world catches up to being able to help with your condition, or your kids grow up and away, or a MILLION different ways your life will change that may make you change your mind and long for another child.