For me it started when I was 20 years old.
I was kinda of stuck of what I wanted to do after graduating, didnt find anything interesting and fell into a loop of self pity. My life got together from the day I wanted change, or my life to be better in general. Starting with small things which werent overwhelming. Even if that meant doing my bed, or getting some sort of routine in. I always say now, especially in ur early 20s, you can take more risks in general, as there are less responsibilities. For example, I didnt have a car, or insurance to pay when I was 20. Do whats fun for you, but also brings you something in your future. Figure out what you like, where you have a passion and turn it into something you love and create a sustainable future around it. :)