Are there any signs or symptoms of masturbation?

I don't understand. That is an activity. Not a disease or condition. There are no "signs" or "symptoms". I don't understand your question.
No. Other then erosions (if you're really rough on yourself) or little brown deposits from old microbleeds (if you use a tight grip), there's no signs. Only charlatans and crackpots claim it will make you sick. If you're a guy, maybe dad would be a good person to talk to; if you're a girl, i bet mom would have good advice. Love responsibly and wisely, and welcome your changing body.