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I could be entirely in-correct; but as a Junior I'm under the impression you could take college correspondence classes. If I was back in HS again I'd find the university and the degree I was wishing to pursue and then check those class requirements for college correspondence classes I could take while attending HS or during the summer. I'd find the cheapest accredited college credits that I could transfer into my college of choice for the degree I was pursuing and save a heap of time.
Volunteer! Find out who handles your computers at school and explain to them how interested you are. In most cases they will let you assist!
I also suggest looking online for any free IT courses that interest you. There are so many aspects to technology, but the more you learn now the better equipped you will be in the future!