I'm going to be honest and say that I don't have low self-esteem or low self-worth. I honestly loath myself. Nearly everything about me, I hate. If I had the chance I would change how I look, how I think, my voice, how I talk, my personality; I'd change all of it without the blink of an eye. There's only one thing I wouldn't change: My ability to care for others above myself. There's no better feeling and it's truly my own redeeming quality. The fact that I can make my little brother laugh when he's having a bad day, it gives me the ability to smile. If only for a mere minute, I know there's one good thing I did.
That's how I live with myself. When I hurt someone, I have the exact opposite feeling and reaction (but that can be saved for another post). When I focus on myself, I don't see a person worth helping.....BUT, if I don't care for that person in the mirror (at least enough to keep them going and fighting); that person I stare at when brushing my teeth won't be able to help anyone ever again. My only redeeming quality would be gone. That's not something I'm ready to lose and so, I do the best I can to try and help me. Sometimes (like lately), I'm not doing a good job about it but I need to. Too many people count on me. I can't let them down like that.
I don't know if looking at it like that will help you or if it's the healthiest way to do so, but it could be worth a shot.