Why the HELL do i do this kind of thing?

You should see a psychologist, these symptoms could indicate a variety of issues such as depersonalization disorder, a conduct disorder, borderline personality disorder and ADHD. It is also possible that you do not have a disorder but are displacing and projecting your emotions and issues to other things and people. Your compulsive lying could have many causes too, most commonly it's fear-that by lying you're hiding from some perceived punishment. Maybe you automatically lie because you want a rational reason for your actions and you're scared that no one would understand that its in your mind, scared of how people will look at you if you say the truth. Pathological lying is common in borderline personality disorder, conduct disorders, and ADHD. According to Freud, your impulsiveness and bad thoughts probably come from an internal conflict with your id ego and superego. Your id is like the instant gratification desire, the "devil" in you; your super ego is your conscience-your morals-the "angel" in you; often expressed with the angel on one shoulder and devil on the other, making a decision. Your ego is the mediator between the two, and uses defense mechanisms to protect itself from anxiety, like the displacement and projection you may be expressing. To figure it out, talk more in depth to a professional; and don't freak out about it, the stress and anxiety around it will probably make it worse. Relax, whatever is up can be found out and treated:)