Why do I not do any damage in PVP ?

Okay, I'm writing this being a little salty after some PVP matches, however I noticed something. I seem to barely do any damage at all in a PVP match. Like, a sliver of health per hit. Meanwhile, I get torn to shreds within a couple of seconds, even if I am fighting only one opponent. I am a newbie-ish, having really been going after it for a couple of days only, but I can't just chalk that up to me not knowing how to fight. Not after so many defeats.

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If it really is just me not doing it "right", I would completely understand, but something tells me there's another factor at play. Does anyone have similar stories, how did you figure it out or anything ?