Items in TFT

Hey guys So, I have recently started playing TFT, and I kinda understood the jist of it... However, in every game the same thing happens: my opponents get many more items than I do (usually one more completed item by the end of round 2, and two more by the end of round 3). Needless to say, I fall very far behind and simply can't win with only 1 item and a half vs 3... How can you get those items? Is there a way, just like when you store gold you get interests, if you don't equip your items for a certain time you get some more? Does it have something to do with the champions you're playing, the in-game level you have...? I can't find the answer anywhere :/ See you on the rift!
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