Bisexual but huge fear of sex with women

Mods: not sure if this should be here or in sexual health so please move it. I don't think it's very graphic

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I'm female and bisexual but much much more into women than men. I've only been with one person in my life and that was a guy. The thing is is that whenever I find forums online for bi/lesbian women everybody is really eager to be with another woman sexually...but that thought terrifies me. I think I just wouldn't know what to do and I'm worried that nobody would ever want to be with me because of that. I think, because I'm a woman, I'm intuitively expected to know what women like and find it more simple than being with a man. But it also feels like men are more simple sexually and it's really easy to find out what to do whereas because I have troubles with my own body I have no idea how I'd ever know what to do with another woman's body.
I don't know... I just always feel like a bad bisexual somehow because I don't seem to want the things I'm expected to want (because of my worry). And that makes me scared I'll never find a woman to be with if I don't already know what to do in bed. It just always feels like nobody else suffers from the same nervousness, which surely can't be true, can it?