Am I doing the right thing by getting married?

Hi there. This is my first time posting and I am truly hoping to get some advice. My question may sound silly, but I am genuinely concerned about my decision. I am a 22 year old female and from what I've been told for the last few years, very mature for my age. I'm currently engaged to a very loving man who is 33. Despite our gap in age, it has never been a concern for us and we were great friends for 3 years prior to us dating. He has 2 children of his own but is in a situation where he hasn't seen them in over a year. ***** of an ex-wife. Regardless of that, were set to be married this Friday, January 25th, and I have one concern that is keeping me from being completely and 100% ready. My Fiance had a vasectomy before we started seeing each other and from the way things sound, if it's reversed there isn't much hope for him to father another child. I know right now that I am not ready to be a mother, but it has certainly crossed my mind. What will happen in 5 years time? I could change my mind and it could potentially be a deal breaker for us...how unfair is that to him... I've addressed my concerns with him and he says while it would crush him if that was the case down the line, he is still willing to take a chance and very much wants to still get married. I know the decision is ultimately up to me, but I'm having such a hard time deciding if I should postpone the marriage until I fully understand if having a child is a desire of mine, or do I get married to the love of my life and just "see what happens?" Thank you so much for any insight <3

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