18 married?

My boyfriend and i were talking about getting married and when and he said that he loves me and wants to marry me as soon as he can because he wants to tell the world that he loves me and i dont know like i want to but idk.... he says he still wants me to go to uni like i want and that he doesnt want me to give anything up for it but im just nervous that he'll ask and i wont know what to say. Thoughts?