Close the door behind you as you leave?

What do you do when one person is spoiling something you love doing and you find it almost impossible to deal with it? Walk away is one answer. But that feels like giving up. Or stay and fight but I don't want to fight. Besides, this person is a far stronger person than I am and I would be on my own. I KNOW I'm over sensitive. I know I need to grow an extra skin. I don't know how to handle this situation at all. I have tried to be friendly. I have tried to stand up for myself. Both approaches have failed.

I think I'll take some time to think it over. I feel a bit despairing right now. Not a good state of mind to make decisions in.