Gonna share a bit of a story: many years ago, I made a comic about two gamer girls who lived in an apartment and their lives together (it was actually called the same thing I'm calling my comic now). I based bits of their personalities on different aspects of myself, but I never really considered either of my characters to be "me."
When I mentioned my comic to one of my colleagues, he casually said "oh yeah the comic about you."
Because of that comment, I felt like I was being narcissistic, so I tried to make my characters more and more different from myself and guess what? I stopped making comics. I wrote myself into a ditch.
Fast forward to today - I'm older, wiser - at least I'd like to think so haha- and I give less of a damn what other people think. "Write what you know" and I happen to know a lot about my life so that's what I'm going to write about.
So, to answer your question: I don't think it's narcissistic to make a comic based on yourself and your experiences.
(sorry if that seemed a bit long-winded).