So I'm 20, and today was my 3rd day at my new (first ever) job. I haven't properly introduced myself to anyone, and I just feel like i've made a bad impression and come across as rude. It started when a friendly co worker greeted me, and i greeted her back in a weird way. Then some other interactions happened where i acted overly shy or just awkwardly. I just kept thinking that all of these people think i'm a weird, quiet loser. It spiraled slowly throughout the day to the point where i felt i might simply break down at any moment because i was so anxious. I went to the bathroom for like 6 minutes to gather myself and i could function for the rest of the day, not without the negative thoughts of course.

I don't want to go trough that again tomorrow, i want to be a friendly person and talk to others but it feels literally impossible, and i come across as an asshole. Please tell me that i'm not alone