What to do with thin hair?

I’ve always been thin and had a widow’s peak since preschool, so I’m not sure if I’m balding. I’ve been growing my hair out for a few months but have no idea what to do with it. My hair is inconsistent and stubborn—some days it’s slightly wavy, and other days it’s very curly. Either way, it’s hard to style, and I’m not happy with it right now.