No offence but this is severely toxic behaviour.
You are only making your anxiety worse, you need to see a GP and get a referal to a therapist or sort this out because by the age of 30 you won't even step outside your house and be extremely depressed (My therapist dealt with many women that never did anything about their anxiety and are very depressed because they cannot leave the house).
I have very bad anxiety, so I'm not just being an ass about it. You knew what going to university was going to entail, groupwork. And if you didn't know, you should have researched it better knowing you have bad anxiety. You will do group/team work when you get most jobs out there, so this will never go away.