Hips Grinding and Popping Really Bad?

I'm 15 and for the past year and a half my hips hurt really bad. both of them have been getting worse.when i walk they are really sore and i can feel them grinding like in the socket. I can sit for long or they feel like they lock up and i have to lay on my stomach to sleep. when im laying on my back if i bend my knee and pull it towards my chest then straighten it others in the room including myself can hear it grinding and popping, again on both sides it hurts so bad sometimes i cant even walk

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