How do you deal with the situations where personal problems keep taking all the attention in your mind while you have to fulfill an important task at work? I keep losing my focus due to such circumstances.

Back in my study days software dev was this weird almost magical thing where you tell a electrocuted stone in a fantasy language what to do.
Now after working in the field for 4 years it has lost its shine and I mostly connect software dev to work grind and people who complain even though they just don’t read.
Maybe the time is near to look into a new field of work. Maybe it’s just not my kind of work to earn money. It’s not even like my higher ups are unsatisfied with my work. My current boss complimented my work a lot in our meeting last week.

Is this normal for developers to feel/experience?

So, I went right into working after getting my bachelors in computer science. The company I'm working for is overall pretty good, I think. My colleagues are really nice people, my chef is a super chill dude and overall its a nice workfield.
There are weeks or even months, when nothing happens though. I go to work, fight through boredom and tiredness and go home. I had several months in the last year where I didn't write a single line of code.

Is this normal? Should I come to terms with this?
I didn't become a software developer to basically sell my lifetime.