Lately I've been thinking............When I was in high school (namely my senior year), I literally got numbers left, right, and centre. BUT then after I got out of school I just became incredibly shy and can't get a number to save my fuckin existence. Even when I'm beyond wasted I can't (well except for one time but she wound up having a b/f, lulz). Can anyone explain why this may be the case.

What is your current situation; what kind of college/work/lifestyle do u have?

It could just be that when you were in HS you were always around people in a common environment where its easy to socialize. Now that you're done with hs approaching random people randomly is a daunting task.

I'm comfortable approaching anyone if I want to, but from experience getting numbers and socializing is most smooth in a common environment like a school, workplace or house party.
I would suggest joining free meetup groups and taking a summer class to ease up. This is what I'm doing also.

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I have the same problem man.

In high school (my senior year) I got girls left and right as well. My freshman and sophomore year I was nerdy and shy, and around the end of my jr. year I started to fit in more, I got rid of my glasses and just started taking care of how I looked overall. My senior year I was looking my best and feeling my best, just felt really confident overall! I hooked up with a couple girls, mainly freshmen and sophomores.

Now that I'm in college, I'm still a good looking guy but the shyness that plagued me throughout middle school and most of high school found its way back. I find it hard to talk to and approach girls on campus (anywhere really), even when they are constantly eyeing me and giving me IOI's.

I think the main problem is, at least I've found, that high school girls, younger girls in general, are easier to talk to and you dont have to run much game on them to get them in bed. I sure didnt. If a girl was into me in high school I would get their number or myspace, flirt with them a little and hook up the next day. No lie. They are just more immature and inexperienced. I, as an older senior, would capitalize on that.

In college the girls are more mature and experienced and don't take much bullshit (a lot of them are into older guys as well ). Being a short freshman (once again!) in college didnt give me much of an edge, or confidence for that matter. So you really have to have solid game. I'm sure it will get better for me as time goes on.

So I hope that clears up a little, good luck bro!

P.S. Drinking to cure social anxiety only makes the problem worse.