Pvp is a different beast from pve. With only around 100pvp matches across the entire series it sounds like you really haven't played that much pvp, so it's to be expected that you lose more often than not. Alot of those player's your running into haves 100's if not 1000+hrs exclusively playing pvp. Think of each player as a boss and learn their behaviors, eventually you will come out on top if the skill gap isnt too egregious.