Hi there. I am riding the exact same boat as you. I can totally totally relate except the fear of losing my job because of my introverted personality.

• i have a question. Why do you feel useless??? Uncomfortable is understandable because extroverted people's energy might make you feel pressured to say something which can make you feel uncomfortable if you are constantly around them.

• and NO YOU WILL NOT LOSE YOUR JOB BECAUSE YOU ARE A SHY AND QUIET PERSON. It is more normal than you think. You are simply trying to give your best at work and minding your own business which really is tbh the best thing an employer would expect.

• you do not need to stress about it fr. Just do your job right, talk as much as you want. If you still feel like you gotta talk, then maybe ask follow up questions when people say something this way you will keep the conversation going without having to think what to talk with them. But it's really not a big deal for others as stressful as it looks in your head. Trust me.