Can I take summer college courses w/o starting college yet?

I will be a freshman in Rutgers University starting this fall so my question is can I take summer courses this summer before I actually start college? The problem is that I accidentally registered for a course without consulting my academic advisor. Basically the course starts tomorrow and I am afraid that I will pay over a thousand dollars for a course that will not benefit me much at the end. Also I didn't even pay the tuition so isn't that supposed to automatically take me off the course or do they add it to my yearly bill. The registering website is even giving me the class syllabus, class schedule and list of text books. Of course my advisor is on vacation and most offices at Rutgers close by Friday. It's now Sunday, class starts Monday and I'm basically freaking out.. I don't have any of the books nor am I the least bit prepared. Heck I don't even have transportation to attend class... Anyone know how I will be penalized if I withdraw from this 3 credit class? Hopefully some one from a Rutgers background can help me here!