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You're only a week in, do you think you're just nervous about it rather than actually not wanting to do it?
I think give it a go for a bit longer, because you probably haven't got much of an idea of what the course will actually be like. If you're still unsure, take a years break rather than jumping into another course.
As far as missing family goes, if it's a genuine issue after a few more weeks you should drop out and do a course at the uni closest to you, so you can either live at home or be within easy travelling distance.
If the family thing is a major issue you should just get over it. You can't stay glued to your parents for the rest of your life or you won't have much of one, it's just something you have to do, so you might as well do it now when you can make the most of it.