"I am so because..."
➙ Well, I know how I behaved. I know how I reacted. The root cause is my bad childhood, bad parenting and you know, many such traumas I experienced.
➙ So, you know the root cause! Or at least what is presumed to be the root cause.
➙ They are the root cause.
➙ Then, the responsibility to change is on you now.
➙ What do you mean?
➙ You are an adult now. The realisation of the causes of your mistakes puts the responsibility of their correction on you. You can choose to change, or wallow in your excuses.