Who's fault my bad score?

This is not a rage-post, I'm just curious when it's really my fault and when not that I die/lose lane, when it is fair to blame me or myself.

Okay, here are some example:

• ADC: I was standing alone under outer turret (support wasn't down yet, not really relevant). So I was standing there, and the whole enemy team dived and killed me. My teammates started to flame me. Was it really my fault?
• Mid: farming and my enemy laner killed me, it is my fault. Ok. But what if the enemy jungler was there? It is still absolutely my fault? Should I just stand under turret and try not to die? Because if I do so, maybe I don't die, but I definitely lose lane.
• Botlane: I'm adc, having a pretty good supp, we doing fine on lane. But then enemy jungle starts camping really hard us. Our does nothing, 0 pressure. And we lost the lane. Blame on us. Fair?
• Top: my jungler keeps ganking and dying, feeding my enemy. And after the enemy leads with like 5 kill, I died a lot, lost lane. No one blamed me, but... After the Darius can dive and kill me while I'm with 2500 hp Poppy almost full tank build, I do feel the temptation to blame on our jungler. Would I be right?

Now, I don't ask you to analise these game. I want you to tell me... When it is your fault that you died/lost lane? (If you'd say that: "if you created the opportunity for the enemy to kill you it's your fault" - well, then I shouldn't enter the game? Since you also can die standing in fountain idle.)