Short rider advice A2

Hey all, I just needed some advice. I have a 24-inch inside leg and my overall height is 165 cm. I’ve visited a few schools this week, and they all use 600cc bikes. That’s fair enough, but I’ve really struggled on all of them which are all 600cc I haven't yet tried 300ccs, etc.. and a couple of schools have even refused to train me because of it.

I’m in the Midlands area, and this is really important to me. It’s honestly quite upsetting because I’ve always wanted to ride a bigger bike, but it feels like I just can’t. As a last resort I’m wondering if I should give up on bikes altogether or just go for my A1 licence instead.