I was really nervous before our first dive - would I be able to breathe, would I get lost, would I have a panic attack under water? I was especially scared that I would get water in my mask, then lose a contact and not be able to see. That is something that still worries me, but so far I have had no problems with my contacts, but lots of problems with my mask fogging up.
One thing we learned in our class is that objects in water appear closer and bigger than they really are. Does that wet suit make my butt look big?