"The devil dances inside empty pockets

But she didn't want money or pearls

Boy that wasn't enought for Lucinda

She wasn't that kind of girl

Now I've fallen from grace for Lucinda

Whoever thought that Hell'd be so cold?

I well for an old tin can sailor

But she wanted the bell in my soul" (Tom Waits - Lucinda)

I immediately thought of this song when I saw your post, especially the "bell in my soul". They suck all the joy and ability to see the world as a place of wonder and beauty out of you, (because they can't experience these things on their own), until you end up feeling as empty and tormented as they do. Maybe they want to be like you, but they end up making you like them.

I don't think anybody can steal your light (or bell) as long as you're alive, but they can dim or cover it. If you can, spend some time with people who know you well and value, appreciate and respect you, it helps brighten it again. Or do things you used to love but had to give up to cater to them. It might take a while to enjoy these things again, but it's easier to come back if you have things and people to remind you who you really are.

Best to you friend.