BPD/NPD traits, here.

Yes I feel the full range of emotions. I tend to feel fear first, but it very quickly turns to anger, which I can feel intensely and for a long time. However I am the more covert and avoidant type, so I usually just seethe in secret and refuse to cooperate with people when I'm pissed.

I don't deliberately tell lies (unless interviewing for a job, because my past is messy and I need money to survive). However when I am anxious or spurned, my brain will definitely focus in on the negative and disregard any positive counters. In this way when I am riled up, my brain can definitely distort things. Once I am calmed down, I usually won't admit it that it happened due to shame and humiliation.

I have cognitive empathy, but emotional empathy is something that I only experience once in a blue moon. It happens much easier with animals than with other people. Since I've become more self-aware over the years, I try to use cognitive empathy to figure out the right things to do in various situations. Sometimes I'm too protective of my own emotions to do the right thing, but most of the time I try.

Two things to understand about narcissism:

1. Narcissism is about heaving a very deep, intense fear of shame and having horrendously low self-esteem, and starting in childhood, the person develops a "false self" and spends their life (without treatment) trying to convince themselves that the false self is real. Actual narcissists can be very self-centered, stubborn, deny a lot and so on.

Sociopathy and Psychopathy are where you get very sadistic behaviors, emotionally or otherwise. "Malignant Narcissists" are actually Sociopaths.

2. It is very common for people who grow with NPD parents to

A. Inherent some of the more vulnerable dysfunctions from their parents.
B. Grow up thinking that they are evil and that they are the narcissists.

Why? Well it's hard to grow up with PD parents and not turn out dysfunctional yourself, for tons of reason. But also because NPD parents project, it's part of the denial mechanism and the fierce protection of their false sense of self. Who do they project onto the most? Their children.

Mom hits you because you are mean. Mom is not mean, you are.
Mom lies to you because you can't be trusted. Mom is no untrustworthy, you are.
Dad gives you the silent treatment because you don't listen.
Dad gaslights you, but you are the crazy one, not him.

So bear in mind that a good portion of self-heralded narcissists on the internet are actually projecting their abusers onto themselves, as they were conditioned to do so in childhood. While they may have various traits, things are bound to be messy.