As an 18 year old, should I be getting deductions on my pay check?

I am 18 years old with a part time job. My moms claims me as her dependent on her tax files, meaning she pays for more than 50% of my expenses, which includes college payments. I recently got my first pay check, but rather than be excited, I was confused because deductions were added which means money is being taken out of my pay check. My mother believes this wouldn't be happening if my manager would have given me a W-2 or W-4 form. So the following questions remain:

1. Should I have money (deductions) taken out of my pay check? If so, why?

2. If I shouldn't be having money taken out of my pay check, what can I do to fix this misconception?