what you’re not hearing about is all the times I’ve been talked over, interrupted, laughed at
this is a theme for me going right back to primary school.
I've read everything you have posted on the thread... and you might have a problem with what's called "language pragmatics". Not being able to predict when the things you say will come across badly to others. Saying things that are slightly "off" so you get laughed at. Not being able to manage turn-taking and joining in conversations so you get interrupted and you interrupt other people. Wanting to share your own news but forgetting to "read the room" first and wait your turn. Wanting to share useful information about a holiday destination but picking the wrong moment and the wrong way to say it.
Many people can do these things naturally most of the time. But for others (and I include myself in that!) it's a more painful skill to learn and we do it a lot more clumsily. And we get it wrong more often, and irritate and offend other people.
For example, this is how the baby conversation incident probably came across to the others: before you shared your own news, the implied message was just "Great news but I'm too busy to sit and chat any more" which is fine. But after your announcement the implication was "the baby conversation was too dull to sit and listen to, but it's fine to stop work and interrupt with my own exciting news".
Also, maybe a silly question but do you know how to apologise properly? An apology can easily come across as justifying or minimising your own behaviour. And people resent that kind of apology - they may accept it on the surface especially at work, but it doesn't really make them feel better about the person who is apologising.
One helpful source is Judith Martin's "Miss Manners" books and column. On the surface they're about "etiquette" and she has a clever "tongue in cheek" style but really they are very good on adult social skills - what to say and when and how to say it, how to manage different social situations, what annoys people and how to put things across. And in the books she's very good at explaining why, which makes it easier to apply to new situations.
Don't totally isolate yourself at work. Keep saying the safe surface "congratulations" and the "have a great holidays", a bit of smiling and nodding along, and wait a few weeks for the waves to calm down before dipping your toe deeper in the social water again. Good luck!