I'm 19 years old, and I have hip pain whenever I sit or sleep on the floor for more than 30 min or so?

It's been a problem for the last 2 or so years. I didn't used to have this problem but since I was about 16, in addition to them killing me after sitting, my hips occasionally get random pain that's like an aching throbbing pain for a few hours at a time. I would blame it on growing pains, but it's been hurting mostly just when I'm sitting or sleeping on a hard floor. I'm not an athlete, or anything like that. My family has a history of bad hips but can it even start this early?