So I'm only 17, but I do a lot where I work. The hotel I'm at originally hired me to do bussing/hosting in the on-property restaurant. Well, about 2 months in, while I'm still 16, the Front Office Manager, who handles all of the check-in, rooms, and sales, took a liking to me, and started cross-training me at the front desk. The previous General Manager who was promoted to Vice-President of the parent company also made it very clear that he liked me, my personality, and especially my work ethic. So, I start working the front desk, and pretty soon the Front Office Manager would rather have me, a 16 year old, on the front desk than the people actually hired for it, and the VP wholeheartedly agrees. Pretty soon I'm not really working in the restaurant anymore, but now I'm basically a special activities employee; anytime somebody has a "project" they pass it on to me.
Well, the Front Office Manager was promoted to General Manager. Along with that, now I'm her de facto assistant. Now, this whole time I have 2 different salaries; in the restaurant I'm making 8.25, but when I do anything else it's 10. At first, I was more than happy to work for that rate; it's my first job. However, I feel like they've been taking advantage of me, especially since the new GM was promoted. Now, the VP has me running through the finance data for the hotel and wants me to work with the Director of Sales to optimize and modernize the new year marketing plan to present to upper-management and ownership. After that, he wants me to go through the balance sheets for the hotel itself and all the departments to analyze it and create visualizations using software like Tableau to find out why the hotel isn't operating on a relatively good profit margin. If the ownership likes it, he wants me to do the other 13 hotels in the parent companies portfolio (including teaching the GMs). I'm perfectly fine doing that, but I don't feel like it's fair that they would realistically hire somebody for 25-30$/hr to do that at minimum.
So, I was upfront with the general manager and basically said, "I think that I should see an increased compensation because my entire set of responsibilities has changed." Her response was neither up nor down. She seemed open to the idea but I guess I was wrong. When asked what I thought was fair, I lowballed at 20%, which would only be 12/hr. She said, "There's grown adults here making less than that." So I simply inquired, "So is it solely because of my age?" She was frank and said, "It's not not because of your age."
I understand that the hotel isn't operating on the best profit margin, but I don't think that it's fair to expect me to work a job that somebody would get paid almost 3x to do simply because I'm only 17. What would you suggest I do? What's the next move?
Edit: I'm actually planning on attending University of Chicago, and not for hospitality or finance, so I don't plan on being around the location (York,PA) or industry for more than a year. This is honestly just a job I never foresaw, and I do have a number of other academic and volunteer engagements, so I want to make sure that my work is actually worth my time.