Ok i can't talk to ANYONE!!! have only 2 friends? how do i flirt back when this girl flirts?

when i was growing up i was always that kid who was poor and so everyone picked on me..then i got into taekwondo and they backed off when they knew that cuz they had this opinion in their heads that i could hurt them bad.. throughout school i was the un-popular guy that didn't talk much.. i used to wear black band tees and was a loner because of what was going on and the only friends i made were these two girls next door who practically grew up with me and we're pretty close.. but now i'm 20 and i still just go to class, do what i have to do, go to taekwondo, do what i have to do and then just hang out with the girls when i get home.. i'd like to talk to people and maybe give them a chance but a part of me thinks they'll use me or something and i don't know how to talk to them, saying hi just seems so awkward and it never comes out right.. last week this girl was trying to flirt with me, saying she needed some help with taekwondo and said i was cute and i couldn't even flirt back.. i don't know how to.. i tried but it sounded weird.. i'm a little shy but i don't get nervous or anything, i just don't know how to talk and what to say... how do i get myself to become a normal human being?Ok i can't talk to ANYONE!!! have only 2 friends? how do i flirt back when this girl flirts?
just read books bro. any selfhelp books. it helps you with confidence with life people and anything you can think of. i advice how to win friends and influence people by dale carnegie or how to talk to anyone by leil lowndes. theres alot of books out there but start with thoseOk i can't talk to ANYONE!!! have only 2 friends? how do i flirt back when this girl flirts?
Try to focus on the subject she would like to discuss w/ you. Avoid thinking she's flirting and concentrate on helping her with taekwondo. Baby steps, man. Try developing a friendship first and then see where it takes you. Don't force it.