gamersules26 suggestions were correct, but now that we know you're items i can now assist you.
Here are the alternatives:
in your weapon, use x2goldenring,skeletonworker, civil cervant (i know it may sound strange but a majority of champs and players default a ghostring card) and on a second gun use x3 golden ring + skeletonworker.
if you have have no mvp cards at all for armor, then i suggest use puppetring / anolian / evildruid
up to you really.. puppetring gives chance of stone cursing people when you are being attacked, anolian gives lvl 3 improve concentration gives you a boost in damage, evil druid prevents poison,frozen etc etc
but yea the reason why you are doing such low damage is because most likely from what i gathered.. you're cards and gears that you have currently dont give you much damage, but that doesnt mean you're useless you can still pvp with people in the same situation as you.