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Sounds like you're in some shit anon, especially as your senior year is just now starting in all likelihood. Unfortunately your state sounds pretty solid, leaving college would be a bad move, staying in school sounds like it is hurting your mental state.
The best I can offer is that even if you can't see the light at the end of the tunnel it is certainly there. A degree in physics has numerous applications, some you may like, some you may not, but a majority of which pay at a rate which would allow you to make good on your lifetime.
Finishing college is a grind, but try to remember that it is first and foremost a test of discipline and drive at least in the states. The world rewards strength, show a little more and you will find yourself in a better place with a brighter future. If that doesn't alleviate your depression then it never had anything to do with the work and you will at least be free to seek an environment where your interest in life returns with the option of pursuing interesting career options unavailable to the masses.
Keep your head down mate, I just graduated this summer, it gets better.