Are you going to leave behind a note before you've

Nah, my brother understands and I couldn't give a fuck about giving closure to the rest of my family.

I might. If I were to do so I'd keep it simple along the lines of "I just couldn't be bothered anymore. Goodbye(hopefully.)"

Yeah, I want them to understand.

No.
I want it to look like an accident, I figure that would hurt my family less than knowing how miserable I was.

Nah, my ideal scenario is travelling to some distant land and dying in the middle of bumfuck nowhere to let my body rot naturally.