WIBTAH if I left my girlfriend due to her being unable to have kids?

I (29M) have been with my gf (38F) for about a year. I’ve admittedly struggled HORRIBLY with women. Didnt lose virginity until 25 and every woman left after our first time having sex. They always ghosted after until this woman. She agreed to have a kid and she has been trying. But she hasn’t succeeded yet.

The thing is that I always wanted at least one biological kid (with the mother as the other biological parent) and now it doesn’t look like that is going to happen with her. She does already have one kid (he clearly doesn’t care much about me, so I’m not worried he’ll be hurt if I take off). I am considering leaving her now, and people hate me for my decision. WIBTAH?