It is common knowledge that 85%-90% of all undergraduate freshmen will change their majors at least once before they graduate. So is entering college as undecided not a bad thing right? Uumm...if you can avoid it, the better. You see, college is a huge time and money investment. Wouldn't you want to make the best of it instead of taking a series of courses that in the end, will serve no purpose other than to extend your college years and make it a lot more expensive? Do your research before hand! In several months, you will have to start taking college courses anyway so research those courses/programs/majors that interest you the most and take it from there. Hopefully you won't be undecided for too long!
Read this interesting article on the pitfall of being undecided: