What do i have? im worry?

im 15, i being living 1 year in usa, im gonna turn 16 soon, and my life have turn upside down, i was good in venezuela, good life there, friends and good things, now i dont have friends, i just talk in spanish with the spanish people, and i dont go out on wekeends, i just go out with my family, and im to afraid to talk in english in school, my life sucks, im worry i just feel nervous in school very shy, all my life im being very shy, that suck, help what can i do go back to venezuela or what? it suposed that usa is better for me, i dont know what to do help.