WHY DO I CARE ABOUT BIRTH ORDER!? I'M AN ONLY CHILD!!!

A FEW WEEKS AGO WE READ AN EXCERPT FROM A BOOK ABOUT BIRTH ORDER IN ENGLISH CLASS. MY TEACHER LOVES TO TALK ABOUT THAT. BUT AS AN ONLY CHILD I WONDERED, "WHAT THE HELL DOES THIS GOT TO DO WITH ME?" I DON'T FIT INTO ANY OF THIS. I AM MY MOTHER'S FIRST AND ONLY CHILD. I'M PRETTY SURE THERE'S NO SCIENTIFIC RESEARCH ON THAT!!! BUT WHILE READING THE EXCERPT OUR PROFESSOR GAVE US (BIRTH ORDER AND SIBLING COMPETTION) I FOUND OUT THERE IS SCIENTIFIC RESEARCH ABOUT US!!! OUR SCIENTIFIC NAME IS SINGLETONS, WE EXPERIENCE CHILDHOOD WITH NO SIBLING COMPETITION AND NO PARENTAL DISCRIMINATION. THERE IS A QUOTE IN THE READING THAT STATES THAT WERE ARE "...CONSCIENTIOUS AND PARETNAL-IDENTIFIED, AS WELL AS... EXHIBITING ABOVE-AVERAGE LEVELS IN ACHIEVEMENTS" (DUNBAR, 304). I AGREE WITH THIS BECAUSE I'VE ALWAYS DONE GOOD IN SCHOOL AND I'VE BEEN ABOVE-AVERAGE IN CERTAIN SUBJECTS. BUT I ALSO KNOW ONLY CHILDREN THAT DO NOT FIT THIS DESCRIPTION. SO NOW I ASK MYSELF "ARE THESE BIRTH ORDER RESEARCH PAPERS REALLY AS ACCURATE AS MY PROFESSOR SAYS?"