I'm a liar and a terrible person.
Why do you think these things about yourself?
Because I think lying is okay in some situations and I think it's okay to be a bad person in others.
It's good to acknowledge things you're doing poorly, like lying and being a bad person, so you can try to better yourself in the future. White lies can be okay but if you lie too much, you may lose friends or jobs, so be careful about that.
Lying and being bad are just things that are part of who I am.
But remember that lying and acting badly have made you feel like a terrible person.  Even though you are used to these things, they are still hurting your self-image.  For your own benefit, try to be more honest and compassionate with others, and you will feel better as well.