Why do i always remember the times that i made a fool out of myself.. and get really mad, sad and upset!?more?

ok.. my music teacher asked me to play the keyboard in front of the whole school. i did & the pedal didn't work, it was so loud i couldn't hear myself, & it turned out aweful wrong notes and everythinh! then i qualified for a district spelling bee & i was practicing with my teacher right before it , & she already probably thinks i can't get anything right because i'm always leaving my flute, purse, ect. in her cl and she has to chase me down and there's been more times that i've totally freaked out in front of her.. everything you can imagine being embarred about.so anyway ha she called out pacifier gosh!!!>. i totally know how to spell it but i completely forgot cuz i wuz so nervous.ha.. i spelled it like pifire!..anyway, it sure made me feel even better when this little 4th grader was like I CAN EVEN SPELL THAT! ugh. then that little girl got 1st place!anyway,how come i always seem to remember all of these times? it builds up&it makes me feel worse. howcani thinkposititivly!