First step

Today I decided to stop being who I am start being who I should be.  I am a liar and someone who does it out of fear and the fact that I am not sure if I am good enough.  I don't want to hurt people but I end up doing so and myself as well.  My gf currrently is not speaking to me bc I have lied so much and she does not deserve that.  Things go good for a few weeks or days then I get caught in a lie and it is back to square one.  Same goes for my friends and family and I am sick of it I am sick of hurting everyone bc I am too much of a coward.  I need help and I have reached out for this help.  So please with god and the support of you I can be better.