I didn't have kids, I thought I was child free, and I'm 50 now, and my friend just had a baby at 53, and now I am regretting it and researching fertility options futilely (turns out it's fairly common to have a baby in your fifties now). I would also very much like to do foster care because I know I'd be good at it, but I'm not set up for that.
Summary; if you aren't sure don't end up in regret like me, have kids.
I'd rather regret not having children than regret having children. I don't want to risk giving a child that life. They'd deserve a parent who really wants them. I don't think this is good advice.
"If you're not sure, better take the safer bet and nonconsensually burden some newly created living beings with the thousand natural shocks that flesh is heir to."
I say this with the assumption that you are not a troll:
I personally think it's great that you are childless because your shit attitude toward even the slightest push back illustrates your lack of patience and demonstrates how much of a shit parent you would be. If you can't handle this, you can't handle raising a child. That push back is orders of magnitude less than even a healthy three year old would give and that is so much less than a preteen/teenager. So with all dude respect (none), you fuck off.