Vikki, your friends sound like they need proffesional help. It's very brave and caring of you to try to help them, but please don't feel like you can do it on your own. Get them to seek proffesional help. That's the best way to help them. The girl, is it, sounds like she's abused and very depressed. Tell her it's the depression telling her that she's not worth it. Depression is a terribly liar! Your second friend sounds dangerous to me!

Please get them to help themselves, ok?

He's making a list and checking it twice...
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.