白上 meaning in English

shiragami
shirakami
shirokami

Squiggly lines , empty canvases , white on white
弯弯曲曲的线条，空的画布白上加白
I feel mathematical major foreground is not big , do not know to later except the teacher still what job suits me , my disposition suits to become a teacher not quite , can you be university went up 4 years in vain
我觉得数学专业前景不大,不知以后除教师之外还有什么工作适合我,我的性格不太适合做老师,可是难道大学四年就白上了吗