A lot of you guys are all mentioning not asking out "that girl" but I'm on the opposite end.

I regret focusing on girls SO MUCH when I was in high school. I was fairly popular was girl crazy. Because of my preoccupation on all things biologically fun, i completely dropped the ball on my education. I finished high school late and let a girl I was sleeping with convince me not to go to the college I was dreaming of. We broke up not even half way through the summer before school. I had to go to a local school and didn't do well. I had another opportunity to go to my dream school as a transfer sophomore year but had a new girlfriend who also didn't want me to move from the east coast out west. She dumped me a few months later. Worst of all, she told me that the reason she dumped me was my dream career would never "make more money than her"... It being the brain fuck it was made me switch schools to change programs entirely. I flunked out. After years of trying to get my head on straight I went back for a general degree in my field, but not at my dream school and not in my desired focus. College took me almost a decade to finish as a result.

I regret letting my dick run the show back then. For me now, married and looking at it all in perspective, I can see that I was driven by a over the top libido and some serious loneliness/depression. If I was just able to focus on myself back then I could have gone to my dream school and been working as a professional in my field by 25... but instead I'm 33 and still not where I want to be.