One first thing your notice is the cultural differences in the first few weeks this is normal whenever anyone changes their lifestyle and encounters unfamiliar attitudes, customs and even foods. The family can help you through this and make allowances for your culture shock, but I’m afraid its up too you to adapt. If the culture differences are way to hard to cope with then it is better to tell the family than to let it carry on, you should not expect your new employers to be mind readers because they may not be able to pick up that something is wrong. They will probably to glad that you are being straight with them and maybe whatever is wrong can be dealt with maybe not immediately but certainly in the future. You may find a loss of privacy and you will have to adjust to this, but you will probably get given your own room which can be a bonus although it is better to fnd out before the placement as sometimes you can be expected to sleep with a small child which can be troublesome especially if they dont sleep very well.
This can happen during your stay but the busier you keep yourself the better this will be. Their are bound to be times when you think of your real home and you will probably miss the little things thats you cannot get in your new home. These feelings are normal for anyone and you must understand this and they will pass and you will find yourself enjoying your new home.