You don't have to be worried about what you gonna face in foreign country. Maybe it will be similar or totally different from Thailand.You can do just adapt yourself and be patient for everything that go through your life. Even it's good or bad anyhow you have to stand and solve it yourself. Sometimes,life goes worse,but if you can pass that period of time,you will become stronger.
If you have any problems,I suggest you to talk openly with you host family.If you keep all of them ,the problems will go worse and hard to solve them out. I don't suggest you to change host family immediately when you got problems. You have to talk them out first and it will get better.
Finally,you will find out that nowhere is as warm as your house,nobody love you as much as your parents. : ))
Enjoy your life ynd your super fun year. Have a nice and save trip. any problems,you can ask or tell me and I am ready to help.
We are AFS : )