The other freshmen and whoever you feel the need to help will be there next week or next year. And they were before you got to school. How do you think they got along without your precious help?
Drop the extra activities. The world will keep on spinning. Stop falling on your sword for this stuff.
My help isn't 'precious' it's probably useless, but they are new students who've never lived away from home so are could have all sort of worries
When I first started this wasn't available, maybe if it was I would've had a more confident first year
Then talk to your school about having them do this. Seriously, I realize you are trying to be helpful (and I'm sorry if my last post seemed harsh). But either way, you need to look out for your own grades and your own mental and emotional well-being.