I have always been confused of whether I am ISFP or ESFP.
Maybe this might give insight, maybe not.
I have had a strong fear of rejection for as long as I can remember. Each year as school got harder, my life got worse. I think back and realized it was not the homework and complexity that gave me stress, it was the anxiety and stress of failing each class that ruined me.
I was constantly afraid that if I got a single bad grade in a class, a homework assignment, that I would be mocked at, and people would see me as stupid or small.
At badminton, I always lost on purpose to my brother because I was afraid if I tried and lost, he would tell my friends and my family (he does stuff like this) about how he is better than me, and I would be seen as bad at badminton and people would think I exaggerate how good I am and stuff.
I was afraid of my parents seeing bad grades, even though it was always on the back of my mind, it was not as immediate as the others, yet it still did stress me.
EDIT: I mean in 6th grade, I was rejected by a girl, and in 7th grade a girl found out i liked her and rejected me even though i did not ask her out, and both girls told all their friends and made fun of me.
This might have contributed, but by far my life has always been ruled by a fear of rejection even before 6th grade.