OP l was like you, didn't want the commitment of babies, didn't wan' t to hold or have anything to do with others dcs, zero interest, zilch.Thought babies and DCs were plain irritating, and pregnancy looked horrible!
At 34 my Dh mentioned we had to decide, trying for Dcs or not, he was relaxed about the outcome......l still felt terrified about the idea of pregnancy and babies, but the thing that changed my mind abruptly, is that one day l was imagining my life at 50 and 60 and my mums then age almost 70.......
I realised that future looked empty without the thought of Dcs and possibly GCs, l realised all the things l was fearful of, loss of independance, inability to just get up and go/change jobs at a moments notice/ travel on a whim/ live in a different country...were things l would not be doing, or want to do for ever.
At 34 l had done all of those things and whilst l still wanted to have an exciting life l realised DCs could enhance it.
Also my DM in her wisdom, said something that changed how l saw motherhood......just do it your way, do it the way that is YOU.
Now l am so very grateful l decided to go ahead despite my reservations, and hating being pregnant, ( both times) as the rest has been pretty amazing and my 2 DCs are my greatest joy. I would turn back the clock to when the eldest were 6 months old and do it again if l could.
This may or may not resonate with you, its just a perspective.