I feel like such an awful person.
Really? Why do you feel like this?
Because I always lie and I never mean what I say.
It's great that you're self-aware enough to recognize your flaws, but if you have bad qualities you should be working to improve them. If you continue to live with qualities that you know are bad, then you may very well be a bad person. However, if you know your bad qualities and you work to improve them, then you can become a good person.
It's cool that I'm a bad person.
There is nothing cool about being known as a liar. If you keep it up nobody will trust you and you will be isolated from everyone else.