Find a bin and throw your USB stick away into the nearest dustbin. Create a google account (if you have a gmail account you will have one anyway) and download google drive onto your PC or Mac. You get 15GB online storage for free and it will appear as a normal drive like a hard drive on your computer. The google drive will has lots of other features too such as online collaboration. Get into the habit of saving all your files here and you will be able to access them anywhere. Imagine having all your files on your phone, tablet and all your computers. I would say that your school internet should be quite speedy (not super speedy) for this to work well.