When I'm Masterbating And Rubbing Only My Clit It Starts

When I'm masterbating and rubbing only my clit it starts burning. Can this be an sti or std??? I have had unprotected sex with several men lately but I do have the birth control implant in my arm. Just havnt been wearing condoms for maybe with 6 different people. I'm scared I know I've been very stupid and careless. I went to the doctor today and have to go back to do lab std tests but I can't stop thinking about it. Is there a chance I could have something?