Ok so I'm not sure if I popped my cherry while I was horseback riding! Help?

Ok so I go horseback riding once a week give or take and I'm not sure if my cherry could have popped or not. Today I was talking to my friend and they said to go and look in the mirror, open up my vagina, and then look inside. I opened it up and they said look for a hole. I saw one about an inch back about the size of a dime. Please help me!