@Mustafa, may I add my welcome to the Guitar Gathering family! My friend Neil has offered wise advice. Yes, you are in a challenging situation at the moment, and my heart goes out to you. Life can pull us in different directions at once. You wrote: “Now I can not even pick the guitar and I feel it is a waste of time, I feel that instead of spending hours practicing I should do something useful to other people. I am out of motivation and sometimes I feel that it is immoral to waste time practicing guitar for hours.” Congratulations, you have the courage to admit what many of us, myself included — even accomplished musicians! — have felt at times.
It’s what you wrote at the beginning that matters: “I love guitar so much and I used to practice many hours a day.” Now, let’s get rid of that useless “used to” and we have: “I love guitar so much.”
Here’s where I concede my space to author Richard Pressman (The War of Art). I've never seen it expressed any better:
“Creative work is not a selfish act or a bid for attention on the part of the actor. It’s a gift to the world and every being in it. Don’t cheat us of your contribution. Give us what you’ve got.”