For a marriage to work, both parties have to be in love with, and totally devoted to, the other.
It does not sound as if this is happening here.
And, to be honest, although it can happen, it rarely does with people who are so young.
People grow and change and grow apart ~ and they need the freedom to do so.
You would be better off enjoying your youth ~ meeting different people, etc, before committing yourself to one person for the rest of your life.
It really sounds as if this boy is not ready for the kind of commitment that you have in mind.
This will be hard for you & it will hurt, but I feel that it will be for the best in the long term.
Good luck
