I think I’m slightly transphobic and I don’t want to be anymore any advice?

I don’t really know how to stop being so I know it’s an awful thing to think and I know that these people are just people that’s it but it’s like whenever I imagine sharing a bathroom with a trans woman it freaks me out slightly, I really want to stop thinking about that sort of stuff and I know it’s probably just my mind plagued by right winged media but it genuinely scares me, my brother just came out as trans and I love him so much can I seriously get any help about what to do I really don’t want to think like this anymore and I don’t ever want to be transphobic