A kid with no sense of security

I think maby i am a child who is short of a  sense named security.i will give two examples to explain why i say it.

first ting,last week ,i did my zhongji treatise which my teacher say it words must outnumber 800 words. the treatise is too different that i think i can only write 800 .so ....... i only wrote 800 words left or right. when my friend see my treatise,he say it must don't get 800 words .i think that teacher will also think......my grade must lowe....

second thing, i also do a treatise but for other teacher,renwen teacher, contrarily,  i  do this treatise quickly ,i must get good grades ,i think, suddenly, a thought occurs to my mind .so many students's treatises did renwen teacher could see it clealy? if he can't ,my grade would not up to a grade that i think it should be .

is it also be talk as a kid without a sense of security?