More often than not, the political party you vote for tells less about how much you care than it does about how much faith you have in government to fix problems. Generally, Democrats believe in more government control and government solutions, that's why they're also for more taxes. Remember, more government means more taxes, or more debt. Republicans usually believe less in government solutions than do democrats, particularly for social problems. This leads them to support lower taxes.
Libertarians believe even less in government solutions.
I'm not quite sure where the Reform party stands these days. Ask your parents what party they tend to lean toward, and why. Politics isn't a caring contest. It's about deciding what role government should play in our lifes. As you read, watch TV, talk to your friends, and experience life you'll develop your own political philosophy.