I Think I Have An Addiction To Rubbing My Vagina.

I think I have an addiction to rubbing my vagina. I prop my hands onto any surface- a desk, table, chairs, any flat surface. Then I place my vagina on top of my hands and pick my feet off the ground so that I'm balancing on my hands. I rub my vagina for about a minute until I get an amazing feeling. I think it's an orgasm that I wait for. I say I think because I'm not sure. I have been doing this for about 5 years, and I do it at any opportunity I have. It's gotten so bad that I skip class to do it in the bathroom. I am addicted. I set goals for myself, like to finally stop on a holiday but I just can't do it. I always end up addicted to it again. I'm wondering if I am the only one.. Please help me. I'm addicted and lost. Is this unsafe or unhealthy?