Marrying young

I know many will say it’s dumb cause I’m only 18. Anyways my boyfriend and I have been together almost a year. I’m 18 he’s 22 We worked out our differences. He recently found out he’s getting deployed 2 places one in June till September and then for another 9 months in December to a different place. We always talk about marrying each other. But he brought it up seriously when he told me about deployment, even tho he still had a joking tone. I’ve been around divorces my whole life to know that i never want to get to that point. But i honestly love that man with my whole heart and i know that someday we will marry each other.

So is marrying at 18 too soon?