Ladys please answer in pain?

ok i am a 13 year old girl 5'8 and 165 pounds size 8 i think and size 12 shoes women usa...and i asked a question last night about why people thought i am having hip pain but not i am having hip pain and pain on the backside of my knee and right above my underwear line it isn't a on going problem but when it does happen it doesn't hurt alot but it is uncomfortable .....so what could it be and my hip has hurt on and off sense april 5??? so please give me your thoughts ideas ways to get read of pain ???