It is important to realize that you deserve to be respected for the volunteer work that you are doing. You deserve a healthy work environment.

Think about the worst case scenario: What if you just quit, right now? What would happen?

Without knowing you or where you're volunteering, I can make a few guesses.

1. The boss will be mad and maybe disappointed. So what? It's THEIR fault that you are leaving. Do you really need their love, adoration, and approval? Can you accept the possibility that this might not be possible, that you don't really matter to this person, and therefore you shouldn't care about what they think?

2. The other volunteers might have to pick up the slack for a day or two, until they get someone else in that position. If they're not suffering this person's wrath, then it won't be that much for them. But if they also suffering this abuse, then maybe it will inspire them to leave, too.

3. Maybe you can report this person to their higher-ups when you leave. This might prompt them to make a change for the better, which would be good for your former cohorts. It might even open the door for your return at a later date, for a more healthy experience.

4. It would relieve you of this highly unnecessary burden. People who do volunteer work are typically doing good things and giving of themselves.

There are probably many other organizations that could use a good volunteer like you, and they might actually appreciate you.

You have to be able to tell yourself that you deserve this.

Best of luck.