I always have the least total damage to champions ;l

And I don't know why! I'm usually toplane, and I try to protect my lane and farm as much as possible since I'm not a star in that. Beside that, I try to engage in teamfights as much as possible and try to damage my enemies. Still, I almost always have the lowest total damage to champions of my team. Last game I just had 4,865 damage (on elin990 account) while the support had double my damage! What do I wrong?
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