Am I selfish or not knowing if I want children?

I’m in my mid twenties and have been told I should start thinking about children by my partners parents. They have one grandchild who without been harsh, they don’t shut up about it, every conversation has the child involved even if it isn’t remotely about it!

Me and my partner aren’t fussed if we have kids or not and both are quite impulsive and like to do what we want, I feel bad for not knowing if I want them, and feel slightly like I’ll be looked down on if I don’t.
I’m fed up of all the baby talk it drives me mad!