I can sympathize with a lot of that. Living with family is hard because it's not easy to maintain boundaries with them. Family often feels very comfortable about stepping right over that line. I don't think it's odd or selfish to want some alone time. You need to recharge.

For work, my main defense was basically going through the motion of putting on a pretend mask and smiling. Smiling will make you feel a little more stable in your mood while you're doing it. It can be tiring to keep it up, but it can be worth it.

Hang in there. When you move out, it will be so crazily amazing that you won't even believe it. My first apartment was a teeny hole in the wall and I LOVED it because it was MINE and I could do what I wanted. I also started getting along with my family better because they started to see me as more of an adult.

It's hard to stay motivated when you don't see the light at the end of the tunnel, but this is temporary. It will get better for you.