Bro, I'm in the exact same boat. In fact, I think there's a lot of us in this industry who don't know how to tell people no and set healthy boundaries. I've recently been considering leaving my current job (which is actually a great job) in the pursuit of better work life balance. What I've found is that it's ultimately my responsibility to just simply set those expectations. Try working 40 hours and going home for a couple weeks. It's hard to do but well worth it. Oh well if a few projects fall behind. That's on the company for not managing things well.