I know the feeling, when I was younger all my drawings were also very dark, even though I was actually quite happy in my life! I think it's fine though, it's a way to get out the dark emotions and express them so they don't stay inside and contaminate the soul. It's a kind of healing!
Now though, I sometimes find myself sharing too many happy pictures and writings, which makes my life seems perfect from the outside, while it's not that glittery in real life. Kind of the opposite!

Really great freewrite by the way, and good to reflect on these things!