It's amazing that, despite everything you've been through, you've still managed to be an amazing father and husband... tell me, how many people would have been able to do that? I couldn't. And I'm sure a lot of people couldn't do that as well

Maybe you're not so worthless after all, right?
Horrible person? Everyone reacts to the death of others in different ways... you didn't cry, but your sadness and love for your sister is very clear from this post you wrote.
I support you and I hope everything will turn out fine for you.. that you will be able to find happiness.