Thanks to everyone for all the great advice! I realize now more than ever how stupid that was. Idiot! Actually, I don't even see why it would be fun in going very deep if it's going to be shorter. Like sex, I would want it to last a long time.
One thing I was wondering is if it would have been safer to rest awhile at the surface, then free dive down to the anchor? I think I calculated it would be fine as I saw my instructor go up and down three times as other students couldn't control themselves and shot to the surface from 55 feet. But today I feel like I have an ever so slight tingling sensation in my right hand, like I slept on my arm. It could all be in my head worrying about it, also.
Thanks again everyone - looking forward to many more (safe) dives!