Making friends at work?

[Andyrourkerip]

I've been in a workplace for a couple of weeks. On the first day, a young woman was training me, and I was with her for a couple of days. She seemed very friendly and bubbly, I felt like we could get along and had a nice conversation.
After that, she was remote working so didn't see her for a while. During this time, myself and the other new starters worked with a different woman who was equally very nice and helpful.
This is our first week where both the women are in the office together. Understandably they've both worked here a few months and know each other better, however the personalities that I saw in my first week seem to have disappeared. The woman who first trained me virtually blanked me until I was in her eyeline then just gave me a bit of a smile. No effort to speak to me, just a polite reply when I started conversation.
Obviously people need to get on with their work as do I, nobody's saying gossip all day, however people usually manage to have a bit of a chat here and there whilst working.
The two women seem to be whispering between them almost. We had a fire drill and all tried to stick together. However the 2 women just sort of walked off really.
It seems a bit of an us Vs them thing.. we've finished training now and getting on with work independently, it's a shame as I felt really hopeful after the first week but I'll just leave them to it.
Obviously I'm just here to do my job primarily, but I did hope to build some connections.
My other new colleague is leaving as soon as she finds something else, which is a shame as she's very nice, the other is a young lad who's nice enough but very young, just turned 20 I think, whereas I'm in my 30s, he's fine to work with really, no issues just different life stages.
The only answer as an adult seems to be 'join a club '. It is very well meaning advice but not a foolproof solution.
It's just life I guess isn't it. School friends are mainly married with children and have no interest unfortunately now.
I know having a tight knit group of girlfriends isn't everything, it can also bring its problems. Not sure what my AIBU is, I guess I expect too much?

I'm like this. I do have a friend I met at work but strangely maybe we only meet up out of work. I think she likes to maintain her relationships at work with her team and it's nice as we do have a really good catch up out of work so it doesn't bother me. A new woman started in my team and we do get on quite well but she is quite competitive at the work and sometimes shows me up. There was a mistake she made recently. A really big one and she got moved away from me nearer our boss and since then it's gone a bit weird. There's a lady who I get on ok with and I guess you could see us as friends but she's a bit all about herself sometimes. I think I'm saying I get on with just about everyone at work but don't seem to make friendships except for the first person I mentioned. Her and I are very good friends but don't hang out in work time. I think it's partly me though as I like quiet time on my lunch break

Most people keep work and their free time life separate, and would rather colleagues not know their private business. Any work friendships tend to end when the employment does. Personally, I work to get money, I have zero interest in my colleagues.

I've always maintained boundaries at work, never gone out socialising etc or being over friendly with any work colleagues except for works do's like Christmas party or leaving do's. It's better that way. I always think I'm there to work to earn a wage, not to make friends.

But then again, I've always compartmentalised my life in other ways too, i.e. my family don't meet my friends, workmates don't meet my family nor friends, etc. Even keep my hobbies and interests separate for each other and from family, friends and work mates. I really hate any overlap.