Some people are clear they do not want children. Others are on the fence. And then the rest of us, well...our desire to have children is just so powerful that we will move heaven and earth to find a way to have them. I don't think you have a mental disorder, I think you have a very strong and powerful drive to have a child. Absolutely nothing crazy about that!
Now what IS crazy, is that I am having fantasies about fostering or respite fostering a child with a disability. I have no time for that, plus my own children don't get as much of me as they want/need. So, I won't do it of course, but the longing is very strong, which seems kinda weird to me! I used to rescue stray dogs, and it seems like that basic drive is still there for me only related to children in need.
We are who we are. At some point you may decide to change course and look into adoption, or surrogacy (if you think something is happening there that is preventing you from having a child). But your path so far does not seem to indicate anything close to a mental disorder, my dear.