Is it bad

Okay is it bad that all I think about day in and day out is that I want a baby, I am 25 and my boyfriend is 27 we have been together for two years, he has two beautiful children from a passed relationship and says he doesn't want anymore and reminds me daily that he feels strongly about it, since this is the case I feel like sex is pointless and at times I don't even enjoy it enough to cum, because all I think about is the fact we are not making a baby, how do I get myself out of this?