Realize it doesn't matter if you make a fool of yourself or not and stop being self conscious
GBAtemp.net - The Independent Video Game Community
x65943
Chary
just throw yourself into social situations. go to book clubs or other meetups at school and find people who enjoy what you do. learning how to adapt and be extraverted comes with the experience (and failure, too) of just talking to lots of different people
kijetesantakalu042
I've developed an extroversion potion. Just take a swig.
Nikokaro
"Stop being self conscious" and "throw yourself into social situations" are two excellent tips! I only add this: don't think (unless strictly necessary) and act intuitively, naturally and spontaneously, without overdoing it. 
x65943
Basically Goku's ultra instinct