Overcoming narcissistic traits

After several years of drama and resentment towards my mother, I finally confronted her with my own feelings, only to find out that she only cares about her own feelings and well-being. "You leech on me, you suck on me, when have I done this to you? When have I laughed at you?" As if my feelings are not important at all. That's when I realised that she is a full blown narcissist that my father and I had to endure for so long.

I realised I do have certain instances where I disregard other people's feelings by instinct and I'm very scared of becoming my mother. I know I cannot escape that part what I am now is from my mom but I really want to cut it out of my life. Sometimes after I said something to my friends, I realised that is not appropriate to say it in the given situation and I enter a state of half regret half fear that I said something bad that it affects my relationship with them.

I really do care for the important people around me but I'm really scared that I'm slowly turning into her. I'm still living with her but I mostly isolate myself from her to try and cut her off. (I'm a young adult, in pre-university)

Every time I see her face, I feel sick in the stomach.