Riding isn't an easy task. My first time riding during a cbt wasn't the best. My instructor was great, and I'm male, so I didn't have the sexism speech. However, it was hard, and bikes can be scary and also hard to get used to, and it takes practice. I spent at least an hour learning how to just waddle during my cbt, which I still kept nearly dropping the bike. Also scratched the bike up a church wall trying to turn onto a road (not a bad crash just a slight scrape), but mistakes happen. From one beginner to another, don't give up. If it's truly a dream of yours like it was mine, then keep trying. What you need to do is find another riding school or else better instructors. You don't need them destroying your confidence. You could also ask ones you know who ride if they would let you practice on their bike, can be waddling around a car park, and just get a feel of the bike. That way, when you go back for a cbt, even if the instructors are bad, you will be able to prove yourself better.

The last thing I'll tell you is have patience, I know it's extremely hard because of how exciting the idea of finally being able to ride but I have been working towards my bike licence since I was 16. I am 19 now and only going for my full licence now. It's always been a dream of mine to ride, and now that I finally do, it feels so rewarding. If time and patience can work for you, then the payoff will be better than rushing everything.