When I was in high school (both junior and senior years), I noticed a really cute (most said very striking and pretty) staring at me in class. She was 2 years younger than I.
Pretty soon, rumors started to spread that she liked me. I didn't believe it -- well, OK, I was pretty sure it was true but I couldn't make myself believe it.
So one day, some friends were talking to me about prom (I didn't want to go) but I mentioned if I did decide to go, I'd probably ask her. Well, I think it got back to her because a few days later, she started talking to me about my prom plans. I told her I really didn't know what I was going to do and she said "Well you know, you have to ask someone soon because she'll need time to pick out a dress, etc."
To this day, nearly 23 years later, I still hate myself for not giving it a shot. Remember kiddies, you'll forgive yourself for opportunities you took advantage of that didn't work out, but you will never, ever forgive yourself for missed opportunities.