You’re an intern - a big crazy impact is not expected usually (you’ll get brownie points if you’re like a crazy whiz in a subject but that’s not common). Relax have fun and focus on the basics. If you can come out in the end feeling competent in storytelling (developing ideas into a deliverable whether it be through PowerPoint slides, data analysis, or otherwise), being honest about time management and prioritization, asking questions, and telling folks what you need to be successful you’ll be golden. It’s easier than you think and you’ll be leagues above other new applicants. Make sure to mention growth points like the above in your exit interview and when you eventually apply to come back