Join college clubs: When you start at university you will find lots of clubs--many of them will include people who share your interest in creating businesses. Who knows maybe even an entrpereneurs club where everyone because membersof onStartups and asks/answers and dusccesses the activity of this board. What -- none? Then start it! :)
Join business associations: The town that hosts your university may have a SCORE, or a Rotary, or a Toastmasters, or a BI -- or some other business group. I bet they would be overjoyed to see a fresh young face in their midst. Earn your way in (see the next point), and you will have a great group of friends, advocates and supporters within 4 years.
Volunteer: The next four years you have a great asset-- your enthusiasm and time. Even if you are working while you are attending University-- find the time to volunteer. By giving you create the opportunity to receive.
Intern: I bet that you can earn academic credit toward your degree doing Internships at local startups. Find out. Go to the career center. Find a cool adviser. Get involved and try out a couple. Figure out what you like, and what you don't like. Intern with a startup associated with a Univeristy allumni.
And through all of this don't forget your number one job for the next four years -- getting a great education. Which of course includes networking with the right people, getting practical experience, and making great lifelong friends. Just don't forget there is actually some pretty good stuff happening in the classrooms and labs as well.