Idk why ive been single for so long?

ive been single for a while now...idk why im going to college, im smart im getting a biology major with a triple concentration (zoology, genetics, and ecology/field work) and a chemistry minor...im not materialistic, im a simple laidback jeans and shirt type of girl, im a bit shy but im easy to get along with...the only thing i can think of is that guys dont