Dating 😀😧

So I'm kind of worried about this guy I just started dating. He's a real love bird. He asked me out today but he's already talking about kids and etc. I'm only 15 and he's 16. I don't know what to do becuz we've only been talking to eachother for 3 weeks now. He says he loves me and I'm beautiful and he is totally respectful of everything but I feel like in the future we might not last becuz I have my dreams too.