Everyone has traits, habitual traits that starts to grow within a person from the day they are born and either will get worst or subside to the age of adulthood. Whether positive or negative experience an individual have, It will put an imprint, locked away in a cabinet in an persons subconscious mind and the only way that it will resurface is if a person is in a state of emotion or physical awareness like happiness, sadness, etc.
you wont believe how a negative word or phrase can manifest into someone thoughts to the point that any memory whether positive or negative will change a person thoughts to have a person feeling like they want to give up or change the way they are already progressing. Don't let it. It's there for a reason take it as a life lesson and progress. look in the mirror and believe that you are an amazing, unique person and you will make it through, no matter what.