Why are female friendships so tough?

As a woman I find it difficult to find genuine friendships with other women. I always feel like my "friends" have a mix of feelings towards me and while sometimes they are supportive, out of no where they'll be aiming to take me down a notch and its hurtful. I'm not arrogant but I am secure within myself and can sleep well knowing I treat all people in my life with kindness and respect. I really don't get the sense this philosophy is shared by very many of the females I encounter. They seem rather insecure and immature to me. It's quite subtle usually, but catty behavior nonetheless, and usually shows up in group dynamics to establish some kind of silly hierarchy. They want me at the bottom. Lol But one on one they are great to talk to. I don't have that same kind of experience as often with men. Is it competition? How can you be a good friend if you are jocking for social status rather than being present to foster trust and connection? I have found a few women who share a hobby with and we get on a lot better because of our unique shared interest and there's much less of that insecure vibe. What are your thoughts? Am I bring unfair to my gender?