Hii
You are not able to adjust with your roommate
I would suggest that you change your room or consult your hostel warden for your problem
Having such an unpleasant company definitely would affect you. The only solution would be to stay away from her
If u are unable to do so, take help from ur parents for getting ur room/ roommate changed
If nothing can be done, u just ignore her, make new friends and stay in their company
Next Steps
this is a temporary phase, it would get better once you get used to this new environment