Should I quit my internship?

So, I'm a senior CS major in college with 3 semesters, including the current one I'm in now, left before I graduate. This semester is the semester where I'm doing my senior project, and I'm also taking two other classes with semester long group projects, so that's 3 projects in total; all three are programming based. I'm also taking a STATS class. I recently started interning at a startup on campus 2 weeks ago, and now I find myself struggling to keep up with my class projects. I would rather not quit my internship cause it's only been 2 weeks, but I don't see myself regaining a hold of my class projects after this week because things are really going to start piling up on top of each other.

This is my fifth year in college, and it would be my 6th year by the time I graduate. Failing one of these classes would prolong my graduation.

I feel like it's in my best interest to quit, but I also feel like it's in my best interest to stay because it would be bad for my reputation. I would really like some advice on this.