... arthritis is awful.
Secondly, there is no-one else in this world you need to please except yourself. You are entitled to live your life as you feel is right for you.
Expectation is a dirty word in my book. If you are 'right' with yourself, the rest will fall into place - or go away. But that is other people's choice - you are not responsible. You are only responsible for getting better, getting your life back on track IN THE WAY THAT YOU WANT TO LIVE IT.
May i suggest, if you haven't already, that you seek counselling (arthritis like problems can be related to emotional trauma - don't know if this applies) and even a homoeopath/acupuncturist or similar. Shiatsu massage is also very good.
Why not make a list of just three things you'd like to change. Don't be frightened of this list. it is for you - so be bold (sensing you've lost some confidence due to perceived outside pressures) and write down what YOU want.
Could be:
Apply to retake final year
Stop being with both guys and take some time out for just yourself
Go out with some real friends for a good belly laugh
Tell your parents that you are not well and need their help
Read up on foods that make you feel great and help arthritis
Clear out your wardrobe even !! Reinvent yourself if you like.
Get a new haircut - feel glamorous and in control again
Hope things start getting better real soon.