I Don't Like that She Reminds Me of Me

Have you ever seen yourself in a character in a book you read?  That's what's happened to me, and I'm not happy about it.  I don't like this character.  She's a good woman that's been dealt a hard hand in life.  She tries to make the best of it but she makes some big mistakes.  She tries, really tries, to make things right but reaches a point where she doesn't want to try any more.  She becomes bitter and unhappy and she doesn't realize how much it affects those she loves.  I don't want to be like her, but I am.  Is it too late to change?  Can I make up for the damage I've caused?