I think its probably a combination of your average GPA from a school nobody's heard about and the fact that you only seem to be applying to companies that have

I think its probably a combination of your average GPA from a school nobody's heard about and the fact that you only seem to be applying to companies that have a reputation for extremely high standards. You seem to be looking at normal companies the exact same way the elite companies are viewing an average student from an average school. Perhaps you should branch out? There are tons of great companies out there with internship programs. And as others have mentioned, I'd try to sell the entrepreneurship experience and any side-projects you may have completed harder than anything else. Keep trying. Keep submitting as many applications as you can to different companies right up until the day you accept an internship.