I have been working for the past 25 years. In the early days, I used to dive in and never come out. As I learned more about myself and what I wanted for me and those close and meaningful to me, I started to set boundaries that I made clear to my co-workers/managers/board members/owners. I have always made sure that I put in 120% effort when I am at work. I seize the opportunity when my co-worker comment on how hard I work (when at work). I will say "Well at work I am working, when I am off, I am not". I turn my cell phone off after work or I don't answer any work emails/text/phone calls unless I have made arrangements with people or have a event where I decide it is better to be available.
I think one thing is to understand that protecting your private life so everything doesn't bleed together is very important. The pundints have coined the term 'Available 24 hours a day' - this is NOT healthy, yet more and more people do it.
You would think that people would have exceptions when I tell them my boundaries and demonstrate that I won't cross them. But I have found that people just eventually accept it. I have gotten around the edge cases
Employer/Manager: "But what if I need to get a hold of you with something important. Answer: "Generally we know when something will be important or critical, in those situations I can make myself available for critical matters only".
Co-workers: "I keep myself available all the time, why should you not be the same?" Answer: "You always complain about how you need to be available all the time, your girlfriend is always mad at you for never be available just for her, the people around you know that you keep yourself available; therefore they take advantage of your openess! I work very hard (when at work), when needed I make myself available, and I have successful friendships, marriage and time with my kids. I am better balanced as a result and therefore I am productive and my mangers/the employer/the board know it, to be sure, I make them aware of it. I suggest you set some boundaries in your working life.
It can be hard. It takes guts to do it, but maybe try introducing some key boundaries that will help give you better balance and see how the people around you adapt. If you don't bring it on too strongly, you will likely be pleasently surprised.
My 2 cents.