Just because you want a sexual partner doesn't mean you should have one, and it definitely doesn't mean you're mature enough to understand what that means and the potential consequences of a sexual relationship, especially at such a young age where even if you've been through puberty, many of your peers are prepubertal and attempting to penetrate a prepubertal girl is akin to torture. Some kids that age are feeling sexual arousal and for some it's still too early.

And "polyamorous" isn't a biological identity like being homosexual. Feeling attraction to multiple people at once is normal.

And I've been trying to be neutral, but you honestly burned my eyes. Your maternal great-grandmother had your grandmother at 14, meaning she was most likely pregnant at 13. The thought of that makes me sick. It's extremely easy for kids that age to die from pregnancy because their bodies aren't ready for childbirth; even though they've been through puberty, they're still growing at that age.

Girls hitting puberty so early is likely not even natural and a consequence of estrogen (from animal agriculture) in the water supply.

Every single whim shouldn't be indulged, especially when the whims are sexual and the people are children.