I have a nephew and a niece. I remember, when my nephew was one, my father's brother asked me if I regretted not getting married and having kids, I told him no. I don't regret not getting married, particularly because I didn't find the right woman, and I don't regret having kids because little kids can be very demanding.
I remember reading nonsense from this ridiculous doctor who claims that men and women should not be just friends, that a man is not a man until he can fulfil certain requirements in a woman's eyes and that women want respect for being able to raise kids. What I say, in response to this ridiculous doctor, is, "Hello, not all women want to have children, either." Yes, many women who have kids might appreciate it if their husbands did more around the house and this ridiculous doctor claimed that their husbands were working long hours and they were expected to do everything. To that, I say, a woman shouldn't stay at home and look after kids because she has to; a woman should stay home and look after kids because she wants to.
The difference between being a father and being an uncle, though, is, my nephew and niece come to visit and they stay for a few hours, and then go home. As a parent, you don't have that luxury.
So, no, I don't regret not having kids and I don't want them. Don't get me wrong, I don't hate kids, I just don't want any.