The way you word this hypothetical disorder and your willingness to be completely aware of your negative behavior makes me think you definitely have aspects of yourself that you can learn to love after you decide to cut your use or abuse. As far as caring solely about yourself, I think this can be a good thing. It can help you cut back your use, care for your health, and get your life going in a positive direction (which goes hand in hand with caring for your use and health, hard abuse has to cut back before desire to have positive direction in life isn't delusional in nature). Eventually nobody has any reason to hate you for caring about yourself too much if you decide to cut back your addiction to where you don't have to delude yourself and can interact with people well enough to maintain social relationships and make accomplishments. These social relationships, accomplishments, and responsibility can build a reality far better to reflect upon than your fantasy world you're deluding yourself with.
You know you are an addict, which is causing you to be this bad person! The bad thing about this is, in the cycle of addiction, your ability to understand and differentiate your addict tendencies and bad actions because they are melted together in comedowns or just being straight strung out. Stop using and give it time. Hell, stop using with the intention of being sober for ever (that is if you can't get the thought of an upcoming high out of your mind) just so you can learn yourself better when you're off drugs for more than a comedown. I believe your self aware nature will hopefully profit from doing that!