Twisted body n shoulder. How to fix it?

Hi I'm posting this question again as my old post doesn't have clear pics as suggested by one doctor. I had an accident 8 to 9yrs ago and slowing my body is twisting to one side. Some years back I used to ride bike straight now I cannot hold handle properly and unable to ride my bike. My left side of body is tight and small. Right side is large and weak muscles. I cannot turn complete left and cannot turn my neck to left side.  I dont know if it's related to trauma or posture but now my body look like this as shown in pic... I dont know if my diaphram is not in proper position or issue with pelvis Even my neck is not at center I'm going to gym but I didn't felt any change instead itseems I'm bending more to one side How to fix it Thanks