Honeslty - don't focus on anything specific. You will be a junior in high school so you're about 16? You know what I wanted to do at 16? I wanted to go into journalism. You know what I do now (I'm almost 24)? I'm a graduate student in ENTOMOLOGY! You WILL change your min about a bajillion times between now and then. I think I change my major......7 times? And I know 1 person who graduated college in 4 years and didn't change their major......their job is not even remotely close to what their degree is in and they paid 60,000 for a piece of paper......Let yourself be open to things.