I need some help ....?

i feel bad about myself very much, i am a immigrant from other country, ever since i came to america, i've been feeling very upset because of the fact that i had to make new friends. but i feel like the older i got, the more depressed and lonely i feel..... i am 18 yrs old now, these times are hard for me.....
i dont know how to socialize well, i've joined a soccer team and i have to say i dont have a close relationship with the teammates around my age. i dont even talk to them, i seem like a stranger... and nobody wants to talk to me, no one wants to know about me..... i heard they talked about many stuffs but i can stand there just listen because i got nothing to share... i have to admit i am very shy, but i guess that is not the only reason why i act like a stranger. i didnt kmow what to say, i feel that i got not much to say, and no one cares what i want to say. i dont know man, i am grown not a kid no more, i do have some true close friends, but not much just a few friends i feel good being together. but on the soccer team.. i dont know man..... tell me what u think, thanks.