Legs posture. (knees rotation?)

Hello. I am 22.
I have very bad posture - lordosis, kyphosis and scoliosis. My butt is very big (maybe because of lordosis) and knees looks rotated.
The main my probem for me is my legs.
Look how strange they looks:
It looks that I am squat (but I cant straight more):

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Can here be methods to improve my legs posture?
 
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