My mother is supporting my life dream, but that's not really my life dream?

I like to paint, and I get told I'm quite talented about it.
My mother took this as me being interested in arts, which is not true because I paint just to relax and see nothing special in it. But it's the only thing I'm good at and since she hates the fact that I don't have a direction in life, I told her what she wanted to hear so she paid for my admission in art school.
I hate the idea of going to university, I'd just like to have an honest job like being a cashier or a factory worker and be done with it. I don't want to pursue arts and I'm considering quitting painting so she stops talking about my 'talent'.
But she already spent the money. What do I do?
My mother is supporting my life dream, but that's not really my life dream?
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