What is my problem? and what can i do ?

i just turn 15 yestorday, im new in usa, i come from venezuela, now i being here for 3 months, and i think my life is turning upside down, in venezuela i have lots of friends, good in school, sports everything great, the problem is all my life i being shy and quiet, but in venezuela my life always was normal, now here in usa is hard for me im more shy, i dont talk with many people in school, and on weekends i just go out with my family, so is stresstful, and im afraid that im gonna lose it all, i talk with some people in my school but just people who speak spanish, becouse im to shy to talk in english, i know just alittlebed english, that i learned in venezuela, now my life sucks, i dont know what to do, i dont want to go back to venezuela, it suposed that usa is better for me, is frustrating and depressing, help i need advice and sorry for my english.