o.k i dont think reading the manuals will help you, i would go along with the rational answer but your emotional answer will possibly shed some light into also so i would not dismiss it. I am happy for you to end me a personal message if you would like to talk further.
it may be that you need to look at what it is that causes you to do what you are doing and the thought proccess that surrounds the actions that are hurting you and eliminate what is the cause, if that is not possible then maybe find other less harmfull ways of coping. I think maybe to understand the thought process is more usefull than changing it. that way you will be more open to exploring less harmfull coping stratorgies.
This can be done in the ABC that i poorly described earlier.
A = anticedent, what has occured directly prior to you acting in a harmfull way. this can include uncomfertable situations interactions, emotions felt etc.
B= Behaviour, in what way did you act as a direct responce to A.
C= consequences, what happened as a direct consequence to B, how you felt, how others reacted. this is not always negative consequences.