I THINK YOU NEED TO CHANGE YOUR PASSWORD AND SIGN IN ID AND DO NOT GIVE IT TO ANYONE OR DONOT WRITE IT ON ANYTHING THAT SOMEONE WITH SNOOPING EYES CAN SEE. YOU CAN GIVE IT TO YOUR PARENTS FOR SAFE KEEPING AND MEMORIZE IT SO NO ONE ELSE CAN ACCESS YOUR PERSONAL INFORMATION. REPORT THIS TO YAHOO IF YOU ARE CONCERNED. IT ONLY TAKES ONE PHONE CALL TO PROTECT YOURSELF. IF NOT TELL YOUR PARENTS HOW CONCERNED YOU ARE. THEY WILL HELP YOU RESOLVE IT FAST. YOU'RE TOO YOUNG TO BE STRESSED OUT OVER SUCH MATTERS.