That's a pretty rough story broseph. You know weed can make people without anxiety disorders have panic attacks. That probably wasn't a great idea.
Can you clarify for me, what do you mean you kept blacking out?
I guess, looking back on highschool and the awkward situations that occasionally crop up...
My advice would be not to try to forget about what happened, in the sense of denial. Its probably more appropriate to sort of accept something bogus happened. Think of that experience like eating bad food when you are hungry. Sure, it was shitty, but there can be some good that came from it.
Sounds to me like you learned not to do drugs, and to mitigate your social anxiety in some other way when at a party setting.
Hell, maybe you'll hit the jackpot and some cutie who struggles with similar issues will become your bff.>but that only happens in anime, right?