I have been to two different Proms, but not my own senior prom... The first one sucked ass, I had a buddy that set me up with a date with one of his friends. I thought it was cool at the time and was determined to have a good time. That ended in miserable failure I was bored the entire night, my date had no interest in even talking to me, and I ended up sleeping on a cold hotel room floor with no pillow or blanket and without even bothering to get wasted. I wanted nothing to do with prom when it came time for my class's, I didn't have a date, knew I had no chance of finding one so I said "fvck it, who needs the crap anyways?"
The second prom I went to was my current girlfriends, she is a bit younger than me and I ended up knowing no one else there. Almost was bitten by a snake and was bored the rest of the night.
All in all they are overrated boring social events designed for the "popular" people to hang out and fawn over how good they look in tuxes and dresses. Not worth the effort or money involved.