They know how to be assertive about themselves and their ideas without being aggressive. These are all skills you need. Your school offers you several different places to develop and strengthen each of these talents. Find these opportunities and make the most of them. Get involved in clubs and organizations, especially those related to your future occupation.
Every profession has a professional organization related to it.
Some have more than one. Maybe only in ten persons in the field are actually members of the organization, but look around. Nine of every ten top people in a field are those members. This is a great time to further expand your network of contacts and broaden your experience beyond your current work and classes. There are also a number of more specialized groups.