@Silvia I know this is frustrating for you but when I read that my first thought (other than being personally embarrassed, as a guy, that this happened to you) was that you really dodged a bullet here. This is not a band you would have wanted to be in, and while painful now, better to learn that up front.
We have a thread here dedicated to awesome women on bass and hopefully that can be encouraging. Here in Japan it’s really common for girls to be holding down the low end in a band. Now it’s likely because all the dudes want to be the guitar heroes, but hey, let them fail at that I say. Always happy to see more women on bass.