How do I change my insecurities and the list of bad personality traits into something good?

My insecurities are effecting my boyfriend and our relationship. I have made a list of the good things about myself and a list of the bad...right now the bad out weighs the good. I want to be better, I want to have a good self image and confidence. Might I mention that my brain wonders at the speed of light and I can twist myself into unrealistic situations at the drop of a dime- for ANY type of situation...it is exhausting to say the least. I have taken personality quizzes and it tells me what I already know...I am dramatic, I have my heart on my sleeve and my poker face in nonexistent. I want to be better not only for myself, but for my relationships. Being 28 female, with a college degree, no career path and feeling like I have no grip on life or what I want to do is only the tip of the iceberg. I know I am fun to be around, I have a great family, friends, an amazing boyfriend...I am blessed with many things...but my inner voice keeps me from moving forward. I could ramble on and on for days, but it boils down to me wanting to be my best self and to silence the crazy person inside of my head...HELP!