maybe engagement?

Okay so this really has nothing to do with sex. But...is it possible to find your true love at a young age. I'm 18 and I have been dating this beyond amazing guy (he's 19) for nearly seven months. But it feels like we've been together for at least a year. And honestly, I think I've found the man I am going to marry and vice versa. Our original plan was to wait and get engaged until I'm out of college, but we both think it's probably going to happen sooner. The wedding itself may be on hold until after graduation, but we both agree the engagement will probably happen before I have my degree. 
Are we totally insane? Or does this make perfect sense to people?