I’m not sure if anyone else goes through this, but I just started a new job and I am still getting comfortable with my coworkers. But new people keep getting hired and my anxiety stops me from being friendly or getting to know them. I have to train someone on Friday even though I’ve only been working a couple weeks and I’m really not ready. My anxiety was so bad today and I’m not sure if I can handle explaining something I barely know to someone I also barely know. He’s a guy too so that just quadruples my anxiety about this. 
But it’s not just at jobs, it also happens in friend groups, the moment someone new comes in I go through the same unfriendly cycle. I know it’s probably just me wanting to protect myself, I mean that is the base line of what anxiety is. But I just don’t know how to break this habit. It takes me so long to get comfortable with people, adding a new one is overwhelming. On one hand it’s comforting to know that I’m doing good enough already to train someone, but on the other it’s so much pressure.