What is it that your exactly scared of?
The people?
There are going to be many people like you-- nervous. The best thing to do is to be confident, even if you don't feel it just do it. You don't want to be cooped up on your own and end up lonely. Be yourself. I was nervous on my first day of High School [I don't have JR. High here in Canada] and well it wasn't as bad as I thought it was going to be
The schoolwork?
It really depends on what classes you are taking, but chances are that the teacher is going to just give you the run-through on what the class is about, maybe even give you a little bit of homework like "read chapter 1" or "fill out this questionnaire about yourself" -- easy stuff
--Is there anything else that is bothering you about starting school?
I know it's easier said then done but "Relax".
You'll be okay-- you'll look back on this day and wish you were there again [I know so].
Sarah