Am I weird for not wanting to hang out with my co-workers?

I work as a beginner level HR specialist. The company I (26F) work at is very big, generally higher middle class people work here. It’s my third month and I still could not get used to some details here. They wear different clothes EVERYDAY. I have once seen a girl wear same shoe twice, and that’s all. One of my peers at the office is in 5600$ debt only because of buying too much clothes. They live with their parents or married. I am the only one living with roommates.

We don’t have anything in common with most of them. When I start conversations or small talks, older co-workers chat with me a little bit and they can be kind but again, the girls are very cold. I also envy them, I do not know when they have the time to style their hair, shower every morning and go to gym.

I caught them (the girls my age) gossiping about me in the restroom. They didn’t know I was there and it was like a dramatic 2000s teenage movie scene. I thought I did not care but I now get anxious when I think about my job and I feel like everyone talk behind my back. Right now when I write this post, my co-workers are giggling and joking about things. I actually do not know how to talk with them anymore. This is also affecting my own personal friendships and my work efficiency. I became a very nervous and anxious and angry person within these 3 months. Which is so absurd to me how quickly it happened.

I need to add a little context about me before finishing. This job is the first “legit” one i got. I can connect with people very easily, people in any shape can open up to me. But in workplaces, I might be distant for the first week or so. I just like to observe, that’s all. This might cause the problem, maybe. I don’t know. Am I weird and awkward now? Is this my new personality? Should I work here a little bit more and gain experience, references and leave?

EDIT: i feel misunderstood a little bit but i was ready for it since this is internet lol. yeah this is anxiety. i didnt have it this severe before working here. i do not want to be friends with them, they wanted me to be their friends on my first month, we grabbed coffee 1-2 times. i refused to hang out several times. i do not have the time to go in so much detail, this is why i excluded so many things. also i think this might be a cultural thing. i talked about this with my friends and they were relating to me so much every time. but thank you for commenting! i will hang out more with older co-workers of mine, try to relax, and focus on my job. more time and more experience will tell. thank you.