You work hard because you want to achieve something in your life. You want to be successful in whatever career you may be in and you do not care about anything else. While this is very admirable, do you know that this can be harmful for your health? If you do not have work-life balance, you may get stressed and develop problems in your body later on. If you want to enjoy the product of your hardship someday, take care of yourself now.
You can do this by allotting time for your family and friends. Work is not the only important thing in life, connect with your long time friends and see how fun it can be. Engage in activities outside work; play sports or get a hobby, either way you will surely grow as a person. Always remember that when you are doing these things, you should not think about work because doing this will defeat the purpose.