xJx
Personally I think it depends on how much you see your boyfriend at he moment. It would be a short lenth of time if you only saw him once a week on the othere hand not so long if you were always together.
Has he proposed marriage and kids or is he just talking about the future. It is a very good thing if talking about the future because it means he is commited to you. Do you live at home, can you speak with your Mum? could help to talk with someone older.
You obviously Love this man so what is scaring you?
We can't possibally know what the future holds.
I'm not going to say do it or don't do it bacuase I got married at 20 after knowing him 3 years and I've been married nearly 25 years and we are still in love, always been faithful and still giggle like kids. I wonder what I was worried about, easy for me to say but it scares me more to think what would have happened if I'd backed off and not risked a broken heart at some point, that was the only reason I had any doubts.
My parents had a terrible marriage so you think that would have put me off but I trusted my instincts and hoped we'd grow up together.
Why do you have to get married? are yours or his parents pressuring you? You could live with him and have children later. I don't know what you both do for a living but I'd defer the kids for a while.
xJx if you do take the plung remember to be kind to each other, sounds silly but its like love glue keeps you stuck together.
you sound awfully level headed for 22 yrs old ;-)