Irrelevant Work Experience?

I am a current senior in college, and the only relevant experience I have is being an analyst for my universities' investment group. I worked event security last summer after failing to get an internship, and the summer before I delivered packages for Amazon. I am a part of a fraternity where I held two positions that I have included under campus activities. I mean to fill up more space, I could include that I was the person responsible for translating cybersecurity information into incident reports that must be clear and detailed for a CEO to be able to understand for a cyber defense league competition I was a part of my junior year. 

I just don't know how to fill up my resume (or if it is even ok to have one thing of relevant experience) if I only include the investment group experience. Being a computer science major for the first two years of college messed with my GPA, so I don't have a 3.7 gpa either.

As of now my resume looks like this: education, one certification, investment group for experience, skills, and then campus activities.

Any help is appreciated.