I'm sooooo glad you posted that! i know exactly what you are talking about with the whole sister thing. I live with mine as well for different reasons, and although I love her i still prefer to do it at a distance!

The whole being nice and friendly, but subtle reminders of all your flaws and debts thing is driving me nuts!!! My sister also would say that she has no problem with me doing certain stuff, but she would then continue to drop hints that it's not ok.

Don't feel bad for staying, it might not be all the fun, but that is what family is supposed to do for one another. If you would do the same for her if the situation were reversed then you can live with her with an easy mind. It might not always be easy for her too, remember that, but if she loves you she will not mind the occasional inconvenience...

My sis is also always trying to give me some chore or other to keep me busy when I'm trying to relax... it's like she has this "relax radar" lol!

Don't give up, sisters are a very difficult relationship to maintain peacefully.