Where? What part of the country?
Figure out where the theatres are and present yourself by mail. Brains and common sense count for a lot in stock. If you do not need a place to live or a salary there are not many theatres that are going to look an unsalaried gift horse in the mouth.
You can always be trained to do a job that you have an aptitude for. There was a firing and that's how I got my first stage managing job. A friend of mine ended up at a stock house as tech director because somebody left, and he was living with his parents nearby.
Someone will always get fired or get another job mid-season and if you are any good you can present yourself again and there you go.
Watch, listen, engage constructively and you'll learn a whole lot more than you will in any course at school.
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher