Right there with you. My life would probably be much better had I spent more (well, any) time drinking and partying in high school and college. The traditional advice to be responsible and avoid peer pressure is correct for the majority of the population, but geeky introverts need to develop social skills much more than we need to incrementally improve our GPAs.
"dating will get easier in your 30s"
Supposedly this really is true for men. Not for me yet.
This is not just untrue for me, but dramatic and stark in a way that has surprised me a lot. I have some really awkward hair loss and I get mistaken for a college student at age 34, and that doesn't help. To a couple orders of approximation, women now have absolutely and universally no sexual interest in me, and this just wasn't true in my 20s. (This is despite me having more money now and being lot more sure of myself, more comfortable with people, less shy, and in better physical shape.)
"dating will get easier in your 30s"
Supposedly this really is true for men. Not for me yet.