Do you have a detailed list of duties? Ask for one. If you don't feel comfortable doing that look for duties of similar positions for different companies. If they are asking you to do these management related duties under some pretence that you'll be promoted to a leadership role, then that's one thing. I think it's fair to have a conversation with your manager about how you are feeling, what you are doing (make a list), what your career goals are, and how you can align that with the company.