A horse that can't be stopped, needs a VERY experienced rider, some serious training, and probably a change of bit and some restraining gear in place. It's an accident waiting to happen and, when it does, a wheelchair awaits more often than not. Please do not ride Barney again under existing circumstances.

I'd question the judgement of your trainer to allow you to mount an undisciplined horse that you obviously can't handle yet. That's just asking for trouble.

Callie