Welcome to our forum.
Polyamory can be quite an emotional experience. Hang in there if it gets tough, and know that the rewards are worth it. It's almost always helpful to work on communication, so keep those channels open as well.
Sorry to hear you've encountered some closed-mindedness from other people. Have you told many people about your poly status? Some poly people (such as myself) remain closeted (unfortunately).
Glad you could join us, and I'm sure you'll have much to share.
Love means never having to say, "Put down that meat cleaver!"