I get the same thing all the time as well. Whats worse is that about 90% of my relatives/family friends that call the house wont know if its me or my little brother picking up the phone. He just turned 14 but hasnt had his voice changed. I think it makes him madder than it does me, especially when my grandmother called one day and thought it was me (not surprising) but when my brother told her it was him she just started laughing and said "wow

you sound like a little girl, when is your voice going to change?"....made him so mad!