I don't know what's wrong with my body

I'm 17 and I have pain from my hips to my feet. when I walk my hips pop and so do my knees. my legs are always acheing. I walk on the outsides of my feet rather than the insides. I know the bone in my knees is falling apart because of genetics. my back is always hurting and I have a bruise thats never gone away on my spine (my brother hit me with a shovel to the back) it hurts extremely bad to touch. My knuckles turn colors if They get cold and then I have extreme pain but even when their not cold my hands ache and my wrists ache

I cant go to the doctor. if I tell my mom she says its because of my bad eating habits which I eat healthier than I used to yet my pain gets worse so I don't think thats whats causing the problems.

I went to the doctor a long time ago for my knees and he lightly touched then and said I was fine. I could barely get my pants on my knees were so swollen.

does anyone have any ideas what's wrong with me?

UPDATE

okay so my hip pain is so bad and it feels like my leg is coming in and our of the socket. it feels like my bones are grinding in my hips if that makes sense.

if anyone has any ideas on what's happening please comment