maybe you should ask this question before you even paying for the tuition or applying for the visa?:p looks like you can't roll it back, so you just have to go for it. make sure you choose your major in entrepreneurship and learn as much as you can out of it. good luck.
I am very curious which program admitted you. I guess most of the top50 schools in North America requires work experiences unless you are olympics gold medalist or other type of genius.
Also, it's quite interesting that you even paid tuition before landing on the campus, which is quite rare for the US schools. Please make sure that the program you are attending is accedited officially.