By Dan Weil A whopping 84% of consumers say they’ve used a P2P service app, such as PayPal or Venmo, with the number rising among younger people. Peer-to-peer payment services, such as PayPal (PYPL) – Get PayPal Holdings Inc. Report, Venmo and CashApp are all the rage. But beware: all that glitters isn’t golden. A whopping 84% of consumers say they’ve used a P2P service app, according to a survey from LendingTree, an online loan marketplace. That number rises to 91% for both Generation Z (ages 18 to 25) and millennials (ages 26 to 41). PayPal ranks as the most popular service among P2P provide…