They say there's someone for everyone...
You sound stable, which is question #1 for me re: having children. Deciding to have kids yourself, especially if you are financially and emotionally secure, sounds quite courageous. I question somewhat your need for having your own instead of adopting. Of course, I'm not sure what the biases are for adoption. Its quite possible its harder to adopt as a self-sufficent, but very single, individual than to go your route.
I'm a woman tho, so maybe you're more interested in what the male posters have to say. Bump.
Second thoughts can generally be amended with judicious action; injudicious actions can seldom be recovered with second thoughts.
--Cyteen by C.J.Cherryh