Usually when you finger yourself you can feel your hymen, I think. If you bled after you fingered yourself and you weren't having your period, I think it's possible that you popped your own cherry. I'm not sure how you can know with certainty.

You can only loose your virginaty in proper sexual intecourse. But you can brake ur hymen with a finger, tampon, dildo or even exersise. Mine broke when i was young due to regular horse rideing. But you still are a virgin untill you have actual sex with a man.