can I just rant for a second?

I'm so sick of the bi-erasure that I've encountered since I came out. I only came out to really close friends, my parents don't even know. I've talked to my mum about bisexuality, not as it applied to me, just to gauge a reaction and she was trying so hard to be understanding but ultimately felt weird about it. I don't know, I just feel like bisexuality is never taken seriously because people chalk it up to nymphomania or selfishness or "experiementing."