I don't want to change my shifts
I can relate. Do these shift changes represent something important to you?
I feel stressed out working for certain shifts.
Changing shifts all the time is quite stressful for anyone. Being able to work with any shift is desirable for many types of jobs, so learning how to be more accommodating for shifts is key. You will limit your job skills otherwise.
Maybe. I still don't want to change my shifts.
Is there a way to work out your shifts with your boss or other co-workers? Maybe if you explain why you can't change your shift they'll understand.