He doesn't want kids.

I don't know where to turn. I'm having such mixed emotions right now. My boyfriend and I are 19 and we've been together for 3 years. I've always talked about children and just assumed I'd have them. I love babies. But tonight my boyfriend told me he isn't sure if he wants to have kids anymore. In all honesty, that statement upset me a little but it wasn't the end of my world. I told him that it was okay. He doesn't think that it is and that I shouldn't be with him because he's keeping me from something I've always wanted. He doesn't understand that the only way I would want kids is if they were his because they'd be little versions of him and I love him so much. He is all that I am certain about in my life. I told him I'm not willing to lose him, something I will always have, over something that doesn't exist yet. And I mean we're 19. It's normal for a 19 year old guy to not know if he wants kids or not. He doesn't even know what to major in. I have faith he will change his mind. But it isn't really him changing his mind, considering that he hasn't made it up yet. I love him. I want to be with him forever. I told him it's a worry for another time, when he actually has a decision. Breaking up is not an option for me. It would ruin my world to lose him, much more than not having children would. I just thought I would share. Any comments are welcome.