Let's go with the premise that we have only one life to live. Do you let others make their priorities yours? It took me a LONG time to learn that if I can't decide what's important to me, then I'm not really living. I'm existing in someone else's life and dreams. Mine get lost in the dust. You have a right to say no, and you have a right to say "this is how I'm going to spend my time, thank you very much." Then, when the day is done, you'll have no regrets.