What does he want?

I'm in a relationship with a guy that is kind of shy and awkward but I still love him. Sometimes he'll text me saying " Would you ever have kids with me? Would you ever marry me? If we broke up would you date someone else right away? Will you ever break up with me? I love him very much but I don't know what answer he wants when he asks those questions. I'm just scared if I say the wrong answer  and he'll either be weirded out or sad or mad or I don't know. I just say I don't know to the questions because I really don't know what to say. I need some advise to help me what to say or if you're good at these things tell me what he means or what he wants when he asks my those question. This relationship means a lot to me so some help or advice would really help me out. Also we are both 17.