Hi!
First of all, don't panic! I've been in this situation before, and here's what I would do:
1) Ask your landlord if it's possible to move things in early. Make sure you tell them that you're NOT planning on moving in, so that ideally you can still pay half rent if possible.
2) If they say no, you might have friends at uni who's landlord has said yes. I've let friends do this before, but see if you can box up your stuff and move some of it into their place. Make sure it's clearly labelled as your things so they don't get lost!
Best of luck and I hope this works out for you!