I’m a narcissist and I need help.

Assalamu alaikum. I hope everyone is having a wonderful and blessed Ramadan.

As of late I’ve noticed a lot of detestable habits and traits I’m currently inhibiting. These traits are similar if not identical to those described in narcissists and I fear that I have already fallen down that path. For instance I noticed I be nice to people like my mother mostly when I feel there is something in it for me. As a kid I always thought it felt better to give to people but lately, my behavior has been incredibly greedy and I would feel hesitant to even a share a small portion of food or snack or drink with my siblings. I feel horrible for this behavior but it became a habit. How do I stop being a narcissistic person? Jazakallah