No it is not but it is possible.

I feel like monogamy is man made. I don’t feel we were put on this earth to only love one person forever.

Yes, it is something in humans that desires monogamy and even marriage. Don’t get me wrong, back in the day the more women a mad slept with helped ensured he had more children. However, for a long time it’s better to care for one family to ensure the children’s survival. Quality over quantity.