When I first met some poly people at university, it blew my mind. At first, I couldn't imagine myself in that kind of relationship, because I struggle with insecurity and expected that I would find that worsened by being polyamorous.
I came to realise that because polyamorous relationships tend to require a greater level of communication and emotional intelligence, that this was actually probably an easier dynamic for someone like me. Key to this was the understanding that if I'm feeling emotionally neglected by a partner, then that's between them and me, and doesn't need to involve comparisons to my partner's other partner(s).
I ended up identifying as a relationship anarchist in the end. It feels more comfortable than either monogamy or straightforward polyamory. In practice, the only difference it makes is in how I think about myself, but that matters to me