I need help socialising!!!?

[Joseph]

Ok here is my life story
Im 16 years old and i used to go to an all boys high school. Back then i wasn't really shy of anyone because nearly everyone knew each other but recently my parents decided to migrate back to our home country which is Spain. When i moved i started in a new school after about a month and since the first day of school i get really shy by everyone. I always blank out and don't know what to say to them when they talk to me. I want to socialise with them but i just don't have the guts to and i don't know why i am like this!! And if i want to "hang out" with some of my classmates during lunchtime i usually just end up not saying a single word!! PLEASE HELP I NEED SOME REAL ANSWERS THAT CAN HELP ME!!