I never did it with mine but there wasn't much of that sort of thing around then. He went to playgroup for two mornings a week, a couple of hours each I think, I didn't have to be there, just took and picked up. He seemed to enjoy that.
Now there is so much more available, including music stuff for very little ones and I might have made the effort for that but, frankly, didn't like the idea of having to be in the company of other parents for however long, chatting and having coffee.
Anyway I worked part time so probably wouldn't have been able to fit any more in.
He started school (would be called a pre school now though was part of a primary school), the month before he was three so he had company of other young children every morning from then on.
You're not unreasonable, not everyone enjoys enforced company - I like my own company, always have, was very happy with colleagues at work but when at home, loved having time to myself or with my son. I don't think it's that unusual.
People back then often did a fair bit of socialising at baby clinics but I took my child to my doctor for vaccinations, annual check ups, etc.