Now do that consistently.
Each champion that was in that match had the capabilities to do just as much, or more damage than you.
There are a few factors such as how often trades have been done, the amount of all ins, the amount of poke, items built etc.
You taking the most damage may also mean that you have been engaged on opposing champions (or they have been engaged / focusing you) and had up time on them (or they had up time on you), your damage is higher since you are constantly going at it with the enemy, more so than the rest of your team.
If
has ganked bot lane with
and
there, the damage all three of them has done to a target will be split between them all, since the enemy only has so much health before they drop dead.
Not to sound pissy or anything.