Left side body doesn't feel sore. On!

When i walk for long or workout, my entire lefg body doesn't feel sore at all and still feel light but my right body feels a lot sore and tight. I have been having right body heaviness for a year now, but after doing all tests , doctors are saying , theres nothing , I am not sure what's going on, When i sit, my left glute is smaller than right, right thigh is bigger than left, right cheek feels bigger than left, My left leg is 4 cm smaller than right, and it happened all of a sudden which I never felt earlier, I keep thinking about this all day and everyday is a struggle and is like a battle ground for me, Could someone please suggest what all tests are there tht I can do so I can sleep eat study focus on goals instead of googling all day. Doctors are the only god's i have hope on!