It can still get extremely serious, though. Not necessarily the wounds, but the addiction. I highly encourage you to do what you can to find a better coping mechanism, but I know it can be hard.

It depends on the sharpness of the scissors, but usually you can't get to hypodermis at all.
And, you are technically correct, though I wouldn't consider it fully dermis by just telling the bleeding.
A yellowish layer usually means hypodermis, yes, but, if it's already bleeding, it tends to have a bump where you fully hit the hypodermis.

https://imgflip.com/i/awcois - for reference of the skin layers - hypodermis is the last skin layer since its the layer of fat directly above muscle - dermis is the layer above hypodermis and is the thickest layer - and epidermis is the top skin layer.
it is very easy to see what layer a wound is at for me - please ask me if you dont know how deep a cut - or any wound - is.

andddd im typing dfrntly from the way i do on my main so its not easy to figure out who i am
if you think you know - mc whoever you think i am and ask if its me - if the person u mcd says yes then its me

and yes my cuts look like that but not on my arms - the drawing is a wrist/hand just because i cant draw legs
and no i havent cut recently - i made the drawing since i think deep wounds and cuts look cool (idgaf if you judge me for it btw i just have a f**ked up mind)