Boyfriend going to navy.

So my boyfriend is literally my bestfriend! We've known each other for so many years.. and well I guess we just realized we were searching for love in wrong places cause we've always been right infront of eachother! I'm a junior, he's a senior. Right after he graduates he's going to the navy, something he's always wanted to do. Well we talked about getting married, if not married, engaged, after I graduate. And actually starting our life together, pronto. That doesn't sound crazy doesn't it? I mean I see a life with him. I know we're gonna make it. I feel if we both feel determined on 'us' then we can make it. I love him, he loves me. We're very mature for our age. We both work, take education seriously, we handle our money & spend it wisely. Just I feel like if we're mature enough to act like adults, then why wait?