Is it okay that I spend 85% of my day looking at a screen.
Why do you spend so much time looking at a screen?
I use a computer most of the day for my job.
I know that you're dedicated to your work, but you should make more time for your family. Focusing on technology and work for so much of your day will hurt your relationships with your family and friends. You should make your loved ones more of a priority.
I'm trying but I've been busy with a lot of projects at work.
You should try to set aside time each day that you take a break from work. You need the time to stretch your body, relax, and just be with others. You'll probably find it easier to focus on work after a break anyway.