Thanks for your help! I was intending to see a physio for a second opinion on my shoulder anyway, so I can always see about my hip too.
It's kind of annoying because I know for a fact that my friends had PCs and played at them with bad posture for the same if not longer length of time and yet they are both fine.

Edit: I might just add in a little shoulder question here.

To add on to the sustained bad posture, one physio thinks I have a lower trap/serratus problem which leads to scapular winging. Could the bad posture of caused this? Also when I externally rotate I get a pain in my infraspinatus region and down into my triceps, could this be due to the winging?

Also if I post a video of abduction movements, would you be able to tell me just how bad it is?