The personal  perception  of a one's own value as a human being.

Most people have an inaccurate self-image and that tends to contribute to a low self-esteem more so than an inappropriately inflated ego, IMHO.

You can't give someone self worth.

If I could give everyone in the world just one thing, it wouldn't be flowers or something Miss-America-like, it would be self worth.

If everyone had that, we wouldn't have a lot of the problems we do today.