Is it normal for a 16yr old to have sleep paralysis?

Yes this can happen. It means you were interrupted during your rem sleep. When you sleep your body is suppose to stop your body from moving. This prevents you from acting out everything you are doing in your head. Why some people have dreams but all that moves is their eyes under their eye lids. So yes this is normal. It means your body has not finished its Psychal of sleep. So it has not told your body to wake up.