Looking back at my school days, there are definitely things I wish I hadn't spent so much time (and effort and emotions) on and other things I wish I had paid more attention to.
For example, boys. My junior high and high school days were filled with obsessing about my crush du jour, and I can honestly say none of them ever returned my affections. Of course it's only natural to have crushes, but I would plan to be particular places at particular times just to get a glimpse of Cute Boy #452. I'd race to my classes hoping to get to sit near my crush. I actually wished upon a star every night for so-and-so to like me back! I have friends who went so far as to join a club just because they guy they liked was in it. (Personally, I would join whichever clubs I found intriguing and then chose one of the boys in that club to be my new crush.) If I could go back and talk to my teenage self, I'd say, "Wendy, take the hint. None of these dudes will ever become your boyfriend, so just concentrate on having fun, and when you're in college, you'll need a personal secretary to keep track of all your dates." (Well, I need to give teenage Wendy something to look forward to so she's not too depressed.)
As far as something I wish I would have spent more time on? Plays and musicals. I love(d) acting and singing but as those of you who play(ed) sports know, being in the school theater productions takes up a LOT of your time and it's hard (maybe even impossible) to do both. Regardless, the times on stage were some of my fondest memories and if I could go back and talk to teenage Wendy, I'd say, "Audition for more plays and musicals. They're a lot of hard work but you'll never forget those experiences."
So, for those of you who've already graduated high school, what is something you wish you hadn't wasted so much time on, and what's something you wish you had done more of? And if you're in high school (or junior high), what do you plan on doing more of (and less of) in the future?