I agree with Verdy. It sounds like a horrible situation to be in, but I think she is right. You should work out roughly how much time you are spending on the extras & go to your supervisor and express that you're concerned that it's detracting from the main task in hand at the moment i.e. finishing the thesis & you feel you are in a catch 22, because you want to do a good job. If the super is the manipulatitve type, try to work around it by appealing to their vanity & frame it as if you are actually asking for advice on how to handle things - whilst making it clear it's bothering you. hope it works out.