is this normal to learn about penises and vaginas in 6th grade

yes, very normal i learned about them in 5th.

It depends, sometimes yes while sometimes its no. If you're uncomfortable  with it always remember to tell your teacher.

when in a crucial situation, after calling 911, the correct posture for delivering effective compression is the proper hand placement.

first, place two fingers at the sternum, then put the heel of your other hand next to the fingers and place hand on top of the other. lock your elbows by using your body’s weight and compress the victim’s chest with a depth of 2 inches.

moreover, do 15 compression and 2 breaths, this process must be done four times until there is a pulse or a arrive.