text: Your voice sound different to you because you here the voice that resonates in your head, but when it is records and played back you aren't actually speaking so you can hear your voice as it sounds outside of your head (literally).  Therefore everyone hears their own voice different than everyone else hears it.  As for the pictures, yes because we all have a perceived image of ourselves in our minds, when we see that still image, if it differs from the perceived image that we have of ourselves, then it appears funny to us.