When push comes to shove, employers are looking for people who have the skills and ability to do the jobs they need done. So your resume needs to show these things, even if you don't have a lot of professional experience. But as you have pointed out, you have activities and an academic record that can show you possess them, despite the fact that you do not have a lot of professional experience yet. Some of the skills and abilities you can show include:
--Deep achievement in your field of study. Did you have a good GPA (3.5 or above)? Did you take honors or graduate courses? Did you write a thesis? Did you receive any other awards or recognition?
--Ability to manage organizations and people. In your activities, did you manage budgets? Did you oversee projects and were you able to complete them on time and well? Did you lead committees? Did you start new projects or new clubs?
--Other professional accomplishments. What jobs did you have in college? What dd you learn from them? Did you develop good customer service skills? Communication skills? Research skills? Did you do something that helped the performance of the place where you worked?
The point is that everyone has to start somewhere, no matter how small. My first job after college was at Starbucks. Even though it was more than twenty years ago, I still have that job on my LinkedIn profile because it taught me a great deal about attention to detail, prioritization, time management, and customer service, and it shows my peers that any job provides valuable experience.
I wish you luck!