If you can, take introductory courses in whatever you're even slightly interested in. I didn't even think I would be that interested in programming until I took the Intro class for it. Now I love it, and it's my concentration. Originally I really thought I'd like networking until I took Intro to Networking and now I'm like fuck that shit.
You should try going to the career center at like any college and ask for brochures on like the demands for different careers and which ones have more growth potential and shit.
Also I wouldn't agonize too much about preparing to go into the computer industry since you haven't even started college yet. You're going to be taking classes with kids straight out of high school who haven't prepared for shit.
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