I need help socialising!!!?

[Esther]

What is happening to you is normal, you need a time to adapt, and this happens to everyone new in the school, especially caming from other country, and probably your mates understand your behabiour as you are not the first new mate caming from other country.
In my opinion you shouldn't care too much about if you are saying the right thing, probably you are too perfectionist and are afraid of saying something wrong and it blocks you.
But don't worry, usually Spanish teens don't tend to judge, whatever you say will be OK.
In Spain, teens like joking a lot, so if you say something wrong and they laugh, don't worry, it will be good for you, they will like you more, I'm not saying that you should make a fool of yourself, but try to learn some funny words, jokes, ...even if they are bad, i think you are going to success.
However, you will have to make an effort, and even if you feel shy you have to talk to them (you can't learn to swim without getting wet).
A good thing could be what Olivia says: follow them on twitter, facebook, and ask them to get included in the whats'up group, read what they write and write messages to them.