Because you play scared. If you adjust to not seeing monsters under the bed all the time, you will improve.

With 6 people to the flop, Villian likely has at the MINIMUM a high flush draw here, or a lower made flush. Try to draw cheaply to a FH, but DON'T FOLD to a min-raise unless you are against the rock. Folding that is weak-sauce, and people will be running all over you...