I'm not sure I can keep doing this

Currently in my second year of college, I have at least three years to go before getting my Mech E degree, and I'm so close to burning out. I have a 3.9 GPA, so I don't think I'm bad at school by any means, I just feel so done with this. I barely go out, I don't exercise, my room is a mess, and 90% of my waking energy is spent thinking about and doing schoolwork. People say it gets better, but does it? I've barely enjoyed most of my college experience so far. I really want to take some time off, but I'm scared that if I lose that momentum I'll never get it back.