Nothing wrong with that. Some people are more motivated to carry out their lives together than spearately. I know some good friends who are twenty and engaged.
I myself loved a girl that much once. Didn't work out though. Sounds like you've been dating a very long time and trust each other.
I don't think that's too young. I think dying in a war at the age of 18 is too young. I mean, am I being unfair?
