Dating: I have zero self esteem. How can I get more?

I have zero self esteem. I used to have more self-esteem before, because I used to just do things. In the last four years I've had depression, several suicide attempts and some other bad things happened. I don't seem to be "getting stronger" from "what hadn't killed me". I seem to be getting more lost and pessimistic. And I used to date, but things have gotten pretty bad. Now I am afraid of dating and talking to women, but most of the time I see no point in doing it. Is there a way to increase self-esteem?