I’d say if you understand that if it gets serious, you will find yourself in a parental role of some kind (specific degree varies situation to situation), and accept that as a something you will step up to as necessary, go for it.

I was a dumb-as-rocks 20 year old when I met my ex-wife and her kid. Now my marriage is over, but I am that kid’s de facto dad and that’s pretty much a ‘for life’ thing. I don’t regret that and they are the most important human in my life, and I like to think I did a decent enough job helping raise them (no worse than my own young parents, at least). But if I had a time machine, I can’t say I wouldn’t go back and ask young Cracks if he really understands what he’s getting into.

That said, circumstances could have been such that the dynamic was different (older kid at time of arrival, more involved biodad, etc.), so YMMV. But regardless, people with kids are a package deal, and that needs to be seriously considered when dating/getting into a relationship. If that doesn’t line up with what you want out of life, there’s absolutely no shame in that.