I'm in Love - is it too early?

Me and my BF are 17, but I honestly feel like he's the one I could end up with. I'm not saying we're perfect, but we get along so well and we never have much drama or particularly bad arguments. He's my first boyfriend but I honestly just don't feel like I'll ever think I'm 'missing out' if he's the guy I marry. We've been going out 9 months now.... is it too early or silly to feel this way?