You're an intern so odds are you may or may not get to do the actual work the hired employees do. It is hit or miss for a lot of employees. Some employers view you as the person to do the grudge work, others want you to have a learning experience. Either way, feeling overwhelming in the beginning of anything new is normal; and this is a new internship, with new duties, with a new social group... that's a lot. You'd be weird if you weren't overwhelmed.

Do not be afraid to ask questions. You're an intern, not a psychic or savant. You are learning a new job, regardless of your background.

Do not beat yourself up. I get overwhelmed starting new things, especially jobs. It's hard. But it should get easier and you'll start to know people and go from there. Even just saying hello to people every day should go a long way.

Hope that helps. You are definitely not alone.