Why am i always Shy and quiet in Skool?

okay get this... i am a 14 year old Dude..that goes to a 7,000 population community...at the ages 4 - 6 i had been a little fighter...the ages of 6 - 9 i been a okay person, who doesn't dress that good in the style...and now ever since at the age 9 i been shy....like i switched skools when i was 9, but then the first year of the new school, i been laughing and hiding my smile all of the sudden...i wasn't rude or nasty, i had been brighter...but shy-er, when i was in grade 7 the rest of my cl and the other cl, had to go to my old school, because the old school didn't have a grade 7, but then i seen my old friends and teachers, but then i notice i was STILL shy.....i kept on hiding my smile and everything....i get little panic attacks sometimes....when im at home im soo DIFFERENT..it's liek i have 2 different lives......is it bullying?....cos there was this jerk in my cl that been insulting me sometimes...and another jerks in the other cles....so i been sititng in cl ALONE,...but i just have this ONE friend that knows i been hiding another life, and i act around him just fine...my bff i guess, but he's never in skool at times... so every morning i worry about him not being in cl or not....and in recess time i also worry about being hit by a ball by mistake (they laugh), but one of of my old friends TRIED and TRY to play with me, one of the girls in my cl actually invited me to play basket ball with them...but i was TOO shy to go.... .....im also shy in public too...and other family memebers....some of my cousins im not shy to be around... just the older cousins, and my auntie's and uncles...i don't know why im like this...i just don't like Awkward moments ....i have a feeling i might end up living in an apartment, with a job down the street..and stuff,and yet im a HUGE fan of Michael Jackson...i dance to his music like 4 times per week....i don't eat that much junkfood, and i go crazy on soda pops..i drink them 7 days per week.....but i have this other life in my head...i imagine that im in a group called "The Teenage Dream", with 1 other guy me and 2 girls that i have a crush on....but they live WAY down south..i imagine that we are BIG starts like Michael Jackson...and yet i am obsessed with WWE also..ever since at the age 3 i been a HUGE fan of it too.....i also go on facebook and youtube ALOT..like everynight, over 7 hours on the weekends at night also...well thats about it....just tell me WHY am i shy?....no "go to a therapist" ...no ......so just think whatever u guys think....give me advice or something..i just want a reason