Your brain has forty tabs open and three are playing music. Close some before you blame your focus.

Difficulty concentrating is often a load problem rather than a character problem. Unfinished decisions, open loops, and half remembered obligations keep consuming capacity in the background, and once there are enough of them very little attention is left for whatever you actually chose to do. The fault is in the number of open things.

Write every loose end down in one place so none of it is being held in your head. Close or properly postpone three of them. Then judge your focus again with a lighter load.