You ARE of value. Just because those stuck-up hotshots in the celebrity world don't put you on the A list doesn't mean you don't matter. Alas, a lot of that world's success depends on luck, who you know, and kissing up to the right people, as far as I have observed. But, mind you, I've never even been a lead in a school play.
I agree with the counseling idea, too. That way, you can come to see yourself of value and get a handle on where would be the best place for someone with your obvious skills and experience. If you have an advanced degree, then you could teach drama at a university, for instance. Teaching would be great. And frankly, teachers make a greater contribution to the world than any actor or actress, IMHO--and a lot of people would agree with me.