How do you tell someone that you’re depressed?

t’s sad that I feel scared telling people about me, but also that I’m scared of my own illness.

Okay maybe you don’t tell them straight away, I usually don’t, though I feel like they need to know about me in case I ever get in a bad way. Just so they are prepared for it - if I suddenly locked myself in my room all day, not eating or drinking, people would probably find me pretty weird if they didn’t know I had a mental illness.