For a long time I thought that I would never have children because I didn't know how to be a parent, then I met the best teacher I've ever had, not only in teaching his subject but also in teaching me how families should be, and how to be a father. That man was more of a father to me in the two years I knew him than mine ever has been irrespective of blood or anything else. He changed my life so much that I really don't know whether I'll keep my current surname, and not a drop of our blood is the same. DNA and genes mean nothing to me, they're not a guarantee that someone is going to be a good parent to you, they're not a guarantee that there will be love between you, that sort of stuff has to be forged, not forced.
You know the saying "blood is thicker than water"? That's a corruption of the phrase "The blood of the covenant is thicker than the water of the womb", in other words, the blood shared in the old days during "blood brother" sort of rituals with sacrificed goats and the like binds people together more than being related through birth.
As for actually raising the child, I know that I'm going to be jealous if I have a son, but I'd rather have a son than a daughter, because I wouldn't know where to start raising a girl. I was tempted to swear to never have children again when I realised that it'd hurt seeing my son get to do all the things I never did, and then I changed my viewpoint on it. Yeah, it's stuff that I wished I had been able to do, but why can't I live my youth again through seeing him grow up? I thought back to when I was in the teacher I mentioned before's classroom, and there was a quote postcard pinned on the wall which said, "it's never too late to have a happy childhood", and that's stayed with me. I don't have to be bitter about it, I can just make sure that my son gets everything that I wished I had had, and be happy in the knowledge that I've been the best father possible.
You need to change your viewpoint on your child. Staying bitter is only going to make your families, and your, life miserable. Give that kid the upbringing he and you deserves. It's probably worth talking to your girlfriend as well about how you feel with her refusing to carry your eggs. Was she doing it for your sake because egg harvesting involves lots and lots of estrogen and other female hormones? Did she not understand how you felt? There's a lack of communication there, it's a big thing to just let lie, and it could end up subconsciously being taken out on someone who wasn't even conceived then.