Is It Normal To Feel This Way?

Sometimes I feel like I want to get pregnant so I can give it up for adoption. I feel bad sometimes about the infertile couples out there and I want to make them happy. I have gotten pregnant before and gave him up for adoption to a nice infertile couple who had 9 miscarrages. I get to see him three times per year because it's an open adoption. But sometimes I wish I was pregnant again so I can make another infertile couple happy. I can't become a surrogant for many reason. Like, I have a violent back ground and I'm on government assistance and I'm mentally ill and I'm not married. All of those things work against me becomming a surrogant mom. So I constantly think about making my own babies and donating them. And like I said, I've done it before but why do I feel like doing it again and again? I hate people who say that it's sad that my son is in open adoption. Because it's not sad! It makes everyone so happy.