Do i have cancer?

ok so im 15 im freaking out about this. There is a lump on my but it is not a blister or any thing. it just looks like a small swollen lump on my . I have never had but i do masturbate. It feels like a small pebble under the skin of my . Is this cancer ! ?? im healthy well i thought i was. Im freaking out and am going into a depressant state. Or could this be a blood clot ? or somthing ! please help thx