people who have depression, what was the first sign that let you know that you have depression?

When I would constantly have a deep sadness but hide it I was five

Never wanting to go out when my friends did and feeling tired all the time.

Once I had a decent job and a girlfriend and still felt sad all the time.

When you feel gloomy but can’t find a reason as to why

Drastic negative changes in school grades
Inconsistent sleep schedule
A lot of crying for no reason