Foster horse or riding share

Foster horse or riding share - I am 12 years old and have been riding since I was 6 years old. Currently I get riding lessons once a week. I would like to deal more often with my favorite animal and am therefore looking for a foster horse or a riding share. So that I can do this independently, I am looking for Rheine and the surrounding area.
You can reach me at 05971/8013945 for more info about me. Your Jana