It depends on your barn rules and what your parents want
It really just depends on parents and barn rules. I’m allowed to ride as long as there is one other person at the barn in case I get hurt.
It depends on the barn rules, but most places yes. I would check with the barn owner/trainer.
If you know your horse and how to ride, why not?When my trainer is on vacation I have to ride alone and it is not a problem... But there are always people riding or with their horses