Your folding the best hand too often and is probably evidenced in your non showdown losses. I am guessing that with your aggression your firing multiple barrels and getting slow played a lot. Your probably not controlling the pot enough with your showdown worthy hands as much as you think. Sometimes getting a fold is not the goal when betting, having worse hands bet or call is ok too. Folding out worse hands with no draws and no overcards on the turn is -EV. See a few more showdowns and use C/R's to allow you to check OOP with marginal hands for a showdown.