You are young and will not always be. I know how hard it can be to get out of something that seems almost impossible (due to hours of commitment, financial issues, etc). But what I might suggest is that you come up with a plan before you take time off. Of course you should take time off, because everyone has the right right to be happy, but knowing that you will make that time worthwhile is really important. Map out a plan for yourself, maybe by the day, of what you will do and explore and see on the road to find what truly makes you happy. There will be something, but finding that something may not be the easiest thing ever.
Just hang in there and keep pushing forward. Depression is the worst, but that doesn't mean it has to always bring out the worst in you.