Let's start with one basic fact. You do not need to decide what to do with your life. Not now, and not even when you get your BA. Really.
As for the rest of it, consider the following factors:
- Distance from home (if getting home is a big production or is expensive, that won't be too pleasant. My parents and I decided it would be a radius of 500 miles from home, and that was a great, easy way to do it. I just took an old-fashioned compass on a map, drew a circle and anything within that radius was far game. Exceptions would be if I got into an Ivy League outside the perimeter)
- Scholastic reputation (US News and World Report gives decent ratings)
- Placement services and success rate
- Variety of programs (if you change your mind during your years there - and a lot of people do - then you want a backup)
- Size of the school (some people thrive in big schools. Others don't. But just because a school is large doesn't necessarily mean you won't get personal attention. The opposite can also be true)
- The likelihood of going into debt, and how much (e. g. are there a lot of scholarships you'd qualify for? This is related to price but it's not the same)
- Consider the location. A lot of people settle where they went to school, and a lot of local businesses are more likely to give hiring priority to graduates of local schools (the exception being Ivy Leagues, which are a ticket pretty much anywhere)
Plus anything else you can think of that's important to you. Order these factors in terms of your own personal priority.
Now, your shyness. You need to try to push past it because this is information that you need. Don't let the world decide your life for you, because you can't talk to someone. I realize it might seem easier said than done but, except for the school you do go to, you're highly likely to never speak to any of these people again. So you've got nothing to lose.
College can be a fantastic time in your life, and you'll carry a lot of it with you for years to come. And the more careful you are in choosing your school, the more likely that what you take with you is a good education, great memories and an excellent resume, as opposed to crushing debt and skills you can't use.