It’s a matter of scale, not a binary.

Having a thing that you need to do but just “don’t” is perfectly common.
Having it happen so regularly that you reliably spend a measurable part of your day wondering why you can’t just “do the thing”, or it starts to have measurable negative impacts on your job, life and relationships isn’t normal.

Everyone feels down sometimes, but not everyone has a serotonin balance problem.
Everyone feels difficulty focusing sometimes, but not everyone has a dopamine balance problem.