Joelbear,
I would say "worth" is connected with growth.
The source of your strength(worth) can never be something you're ever afraid of losing.
What is best in you? That is worth. What you might consider as a weakness others might see as worth.
By this even "bad" things can be worthy. For example, my time with the WTS, while for the duration of the experience on the whole was "bad" now I am seeing just how worthy it was. I would not be the person I am today without those events.
I remember a conversation my dad had with my aunt(a strident JW) regarding homosexuality. My dad pointed out to my aunt that God loves homosexuals, he might not approve of their conduct (aunt citing the usual scriptures) but that did not mean he hated them. She couldnt accept that.
I realized he was right. One of my favorite music groups lead singer in high school was was either bi-sexual, or homosexual. Does it matter? His talent, the range of his voice, were extrordinary. Of course as a homosexual, I denied my acknowledgement of his ability and disowned being a fan completely. It wasn't cool. But what I was really was doing was labeling myself. He existed as a person with his own worth and I could not accept him and all that he was for who he was. He simply did not fit in my "approved" view of the world.
That conversation between my dad and my aunt had worth, because I saw my petty judgements and experienced growth. That is worth. You dont need to be Einstein, Salk or a yogi to do that.
If you want to change the world, change yourself first. Because it's only when you've changed, grown, if you will, that you realize and understand what little chance you have of "making" others change. But perhaps through your example you may help them question their future growth.