Which part is curved, the small of your back, or the upper part, by your shoulders? A normal back should be curved, kinda like an S shape. Yours may or may not curve more than normal, but it should be curved.
I don't know how much you can do for it though. Maybe go see a chiropractor. The only other thing I can say would be to sit up straight, but I'm sure you've already thought of that.
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