It started about a week ago. I don't know when, or how it happened but I've been randomly getting pain in my left testicle, and side at the same time, or very close to eachother. I don't know if it's connected or not. I'm just about to turn 18, I'm not sexually active with anyone else, but I do masturbate regularly. I haven't had the chance to to go to a doctor since It was just casual pain at first but it's started to hurt a little more recently. Should I be worried, or have it checked out soon?