How do I tell my partner I want to be polyamorous?

I am a bisexual female. I’m attracted to nene and women about 50/50, however I’ve been with less women than men and I still am young and want to explore. I don’t believe polyamory is wrong. I think we all just love who we love and it’s natural to love more than one person :). I understand it’s not everyone’s view, but it’s mine! I’ve been dating my boyfriend for 4 months. We have been monogamous our entire relationship. I’m ready to bring up polygamy to him but I’m not sure how to. I don’t want to hurt him or be lectured about how my views are wrong. Has anyone been in a similar situation? How do you suggest i bring it up?