Boyfriend problems, please give me some advice!?

i have been dating bf for over a year. we yes love each other. i dont want to break up. He always says he is going to marry me , which could very well be true but i feel to young to even think about marriage. i am a teen i just want to have fun (not ually). he tells me he will love me for ever and that i am his soul mate. I really love him and I am not breaking up with him ( for a while at least) I have tried to tell him i just want to focus on now but we always end up talking about the long distance future. truethfully I can't tell now if he is my soul mate for life , who can blam me for that. breaking up is not an option and i do love him and i never want to hurt him. please dont say i am just a youngster and dont know what love is ok , thanks. i am in high school ( please dont tell me he is my high school love , i have already went over that in my head) advice anyone?