If it makes you feel better, I'm an adult with a decent high voice (I'm 20) (it most likely will never get any deeper). Heck, it's more of a complement because people think I sound young. What you need to understand is that there are lots of jerks on the Internet and there's no place that is safe from them. The best thing I can say is for you to be mature and respectful to others online and you might get their respect for it. If you do meet these jerks, don't help them or even play with them.