So, I have a 2014 Macbook Air and I only have 10gb left out of my 128GB SSD and I don't know why. I've constantly been deleting things and I'm pretty sure i've deleted everything expect my most important files but still, there is 118gb worth of stuff on there. WHY!!!! I went everywhere in the Libraries and System files (no i didn't delete anything important) and still I can't find what is taking up so much space. Help!