Hi rebecca2010,
welcome to PC. If you have the financial means to solely support a child, along with emotional support from outside, then I would say, go for it. It's really no different than if a woman has a one night stand and happens to get pregnant. I think if a woman realizes she's not going to find a stable man and marry, but time is ticking - I don't see what's the big deal. Sometimes the gay community will get their friends to agree to be the contributing (sperm/egg) partner in getting pregnant.

Even though I have a husband that contributes financially to my children, unfortunately his contribution to the actual parenting is very small -basically I do all the parenting except for a small part. If I was in your shoes and could support a child - I would do what you're thinking about. It would be a good idea to get some experience with taking care of a baby.

If you have a therapist, you should also discuss this as well. I also didn't get the impression you're trying to fill a gap or being selfish. I think you're just being realistic. There are people who for whatever reason don't have luck in relationships - they don't don't deserve to be childless, just because they can't find a partner. I support your decision, as long as you have the means to support a child, along with family/friends.