A job should be what enables you to do those things in life which are important to you, not be what is important in your life. Which is not to say a job should not or can not be important, just that if you try and derive your meaning in life from your job you likely will never be happy. So those nurses and doctors do something important, after work they go out and bitch about how it is all meaningless because no matter how much they try and help people those people largely ignore the doctors and nurses and do nothing to actually improve their health beyond going to the hospital when they have no other choice.

So you sit in front of a screen for money, will your life be more meaningful if you stopped doing things for money? Tell your family they are going to have to do without money because you need more meaning in your life, I am sure they will understand. If you can not find meaning outside of your job what makes you think you can find meaning through a job?