Hey Liz,
When I was in college 18-21 years of age, I always bragged that I would have 8 kids. I didn't get married until I was 30. It took a while to find my prince but he was worth the wait.
DH is like you and did not want kids ( he knew from an early age) and he was very upfront with me. I was OK with that and I am perfectly content now to be an auntie to 12 amazing kids. We are both happy with our decision and I have no regrets what so ever.
You are still young. Your prince will come when the time is right for you. You are a good person and I know good things will come to you, probably when you least expect them.