When i was playing minecraft i realize i using some creepy skin. I never download new skin, i only use steve skin i'm curious because i'm the only one who play minecraft. Or maybe its a ghost like herobrine?
PS: trust me its very creepy and i never touched F5 keyboard again
Somebody probably hacked your account.
Maybe your account was hacked, you should consider changing your password at minecraft.net
Do you have a friend or anyone else using your account? Tell the person to stop if you know who it is. Also, herobrine stuff isn't real, so its probably a hacker. If its a hacker, then a) go on minecraft.net, go to profile, and download that reference skin. Edit it with things like paint, and match it to the size, then upload. B) If your skin changes again, redo step a). C) If it changes once again, quickly change your password, then you should be all good. And, make sure you didn't download anything with key loggers.