I could and did take DD to pubs etc as a baby where appropriate (not smoky or loud places etc and only ones that really didn't mind). But there were certainly things I just didn't much feel like after I had her.
When she was tiny I hadn't previously realised that I would need to be with her almost as much as she needed to be with me. Obviously not everyone feels like this and I do think it might be a form of hormonal madness in a way.
And I also hadn't properly realised that she might be really upset by being left with other people (even when she knew them really well and I absolutely trusted them and only for a shortish time).
I also didn't realise that she'd refuse to ever take a bottle and wouldn't drink more than about 50ml of liquid in a day (and never milk) from ANY kind of container other than my breast until she was well over a year old. Somehow when you are worrying about your baby being thirsty, a drink after work seems like a lot less of an attractive option.
I didn't realise that when she first started talking, other people would have literally no idea what she was on about and I would be the only person in the world she could actually talk to and be completely understood.
I didn't realise that when you are at at home all day being TALKED AT by a toddler who will not be quiet for one second, the only thing you want in the evening is some peace and quiet and the last thing you want is to talk to any other people, no matter how much you like them.
I didn't know that I'd have a complete velcro baby, either, who developed separation anxiety at about three months and still doesn't seem to have entirely got over it at four.
I didn't know how much I'd want to be near her and just be able to pop up and see her little sleeping face at night, either.
It can't be denied that my social life has lessened since having a child. But it also can't be denied that I wouldn't actually want the same social life I had before her any more. Having a baby totally changed me.
PS OP, YANBU!