I was the same way too... and same as manicminer it was much worse when I lived with my parents. When I was in high school I would find excuses to not come home until literally it was time to go to bed just so that I wouldn't have to see anyone. I "moved out" when I went to college and it got substantially better, but I'd still have to live there during the summers.

My first full year away was my 5th year right before I graduated. Occasionally if my husband and I are going through some stuff will I want to not be at home.

I always found that writing or drawing was very helpful to cope when I lived with my parents and even sometimes still. As annoying as it no doubt was for my parents when I would isolate myself, I thought THAT was a far better alternative than to snap at everyone and continually rage at people. Writing especially is something I can do that doesn't require me to physically go anywhere, but it allows me to sort of mentally escape for a while.