Kien i worked in hospitality for four years and in that time you see stacks of people coming and going ..
i don't think its SA that stops people from meeting other people as i'm fairly quiet and i was making friends with really outgoing people because i involved myself around them and showed interest, its really that simple ..
I also learnt a simple trick that does work, its as easy as properly introducing yourself to others, i can recall many times i wnated to approach certain staff just to say hello and i didnt, but a number of times that i did those staff would always say hi when they saw me the next time and eventually that led to layed back conversations and then i made 2 friends out of it ..but many people i didnt acknowledge their existance because i expected they would acknowledge me first and so no possible friendship could eventuate ...
chatterbox outgoing people on the surface seem super confident and socially they are that doesnt mean they dont want to make a friend out of you ...on the inside they feel the same emotions as you they just express them vocally, their lives may not be all roses though in reality, talkative people are there to help you too, they can lift your spirits if you get stuck ..
if you come across others that are more shy then you already have something in common, thus its a win-win ...
I've been to a number of music festivals this year and didnt say alot but i had strangers walking up and they stayed with us for the whole day because they wanted some chums to talk to for the day, i didnt say alot but they liked me anyway ..i dont know
so i believe the more you start showing up to places populated by other people the chances of you meeting people you like will sky rocket ..