I think I'm just a bad person
Why do you think you're a bad person?
I just wanted to do well in life but I only seem to fail at everything
You shouldn't think you are a bad person, are you making people's lives hard, or are you hurting anyone? Only you can improve your situation and if you keep feeling bad about yourself it's not going to happen and you're never going to be a better person.
In terms of relationships, I definetly fail.
I think that what most people don't realize is that relationships take a lot of work from both parties. There needs to be a great deal of compromise and commitment.