Why am i still a loner?

i promised myself i would get a crowd of friends by high school when i was in middle school. but during time out of the cl like at lunch i don't have anyone to hang with. i would eat by myself if i felt like eating and if i don't i would spend the whole lunch time in the library. i could say i have 5 friends right now but they only talk to me during cl. i find them at lunch and they ignore me. i was told i had a great personality like the gilmore girls. i don't think im shy but why am i so quiet? and i don't greet my teachers when i see them and some of them probably think im mean. i can't go up to people and say 'hi my name's sally...what's yours?', can't i? if a stranger came up to you like that, how would you react?