Oh, I see you posted here too
Well, I think it's great that you're working on negative core beliefs and CBT and such!!
It can also be a combination of factors...
I already posted some things at your other post...
Not sure, but for someone with uni, do you hate the job at charity shop cause it might be sort of 'beneath you'?
Actually, I think it's a really great and environmentally-friendly way to keep things out of landfill and maintain a healthier environment for us all..
Also, it can give you some people skills and experience and refrences for better jobs.. (I know at least one other person on this forum who hated working in a charity job though too, said it was too many people..)
What kind of exposure thing are you working on, have you taken it gradually? Or did you mean the 'jump in and go with it' approach? Sometimes it can work, sometimes a more gradual approach with 'backup support' might be better..?
Also, for many people their first job was very stressful.. A friend of mine only adapted to it after one year, and it wasn't that complicated.. The first year she just worked and slept a lot.. Then she started going to the gym, she says that helped a lot..
Especially if you need to learn a whole lot of little things you've never encountered before, or if you might have any nonverbal learning difficulties or be a bit clumsy (like me

), it can be stressful.. Or if you don't find it meaningful or important..
Sorry to hear people are rude, is there any way to take it playfully or just avoid situations when they might be such? Can you think of situations when things could be worse and then brainstorm ways around that to make it better? Maybe they are also intimidated with your uni credentials, some people with lower education can be, or afraid for their jobs or such..