How did everyone feel about the speed of hair loss progression?

My hair has definitely become thinner and weaker than before.
It seems like the amount of hair falling out has increased, so I am worried that I might be experiencing hair loss.
However, it is difficult to distinguish whether it is due to the season or actual hair loss.
I am curious when everyone first clearly felt their hair loss progressing.
I would also like to know what change appeared first in the early stages.
I am also curious whether the crown or the M-shaped hairline progresses first.
Please share your experiences.