Is it normal if I can't live without music and listen to it for at least 8 hours a day? And it takes a lot of time and attention, even if I combine it with something.?

This is completely normal. I, when they forget headphones, I have depression.
I love music, listen to different things. I even have to take spare headphones with me so that I don’t have to go to work and forget.

Yes, this is normal, but as long as youth compensates for hearing health, there will be no problems with ears. At a later age, this hobby will make itself felt on the negative side. I recommend now to wean yourself from frequent drying out of musical compositions, before it's too late.
Comment on reply ...

For me, headphones are like an inhaler for an asthmatic. I don't even leave the house without them to go to the store, and I always take spare ones on a trip. I listen to music whenever possible, especially on the road. Many of my friends are annoyed by this, they take it personally, thinking that I'm so bored with them that I take up the headphones. In fact, they just don't understand that I'm not listening to music out of boredom. I just really love music, that's okay. And everything is fine with you.

The scientific name for this phenomenon is Lizomania. The term was proposed by the poet Heinrich Heine in the 19th century to describe an unusual surge of emotions among fans of the performances of the famous Austrian composer Franz Liszt. Fanaticism of fans is so common in our time, for the prim 19th century it was something incomprehensible, compare the diseases and by the way, in some places people even tried to vaccinate against leafomania. Later, this term ceased to be associated exclusively with the work of Liszt, and began to mean simply pleasure and the irrepressible desire of a person to listen to music. Naturally, there is nothing wrong with that. In the same way, I listen to music almost all my free time and cannot leave the house without headphones. You just don't need to overuse listening to music at high volume.

I can't say anything from a scientific point of view, but I can definitely say that you greatly overestimate yourself. Thousands, if not millions, of other people around the world live in exactly the same way as you do.

I myself only taught myself a couple of months ago to turn off the music during important work-related matters. The rest of the time she plays with me around the clock. Perhaps with a nap break.