You can make a difference. Leadership is not exclusive. Anyone can lead right now from right where you are.
Talk to your SGA class officers and find out what events are coming up and how you can get involved. Make suggestions for things you would like to see done in the school. Advocate for your club or organization and partner with the SGA to make your dream a reality.
Start learning to lead by finding out ways to lead right now! Use resources available to read about how you can become a better leader. Find a mentor, be a mentor! The best way to become a leader is to take opportunities for leadership experiences. The difference between who you are and who you want to be is what you do.