So confused

My fiancé and I have been together for sometime now. We both have decided that we wanted to start a family. So I’ve been so excited that he was fully going to commit to something like this big! But when it comes down to it he either lies about going inside me or he just always runs for the towel. I just don’t get it. Or if I’m just getting off my period he gets grossed out but what’s left over from it. It makes me feel like he doesn’t appreciate me in any way.. I just don’t know what to do from here. Or he will say yes I want to have a baby let’s go now but never fully finishes. Or when I want to talk to him about kids and when to try he says I want better things in life. And they take to much money. Like I think that’s so disrespectful and then I start crying because that hurts me in so many ways.. but every time that he doesn’t even want to try to have a baby when he goes on his towel I say I’m going on birth control but he gets so offensive about it.. I just need advice..