Keep yourself open and adaptable (Score 1)

I would not want to lock myself in a particular position, if I were at your age. Technology changes over time, and demand for a particular knowledge is changing with it. If at this point you would like to be a sys admin, do that. But do not neglect academic education (as oppose to training & certification). I would even suggest that you put higher priority to it, and does sys. admin part time. Things are changing, and changing fast.