Well starting out when I did there were not as many choices but I'd do one thing and this has not changed. Take your 3 choices head off to college then spend time as a student worker in different depts doing different tasks, doniate time to a non profit, this is an easy way to get an inside view of what these jobs call for. Oh and work study, internships all of it take advantage of the 4 years, much can be learned from these areas. As for stress any job has them, strike a balance in your professional and private life. In short have a life outside computers