Why? I'm very don't believe it!!

last month i submitted my Linux assignment..i do it by myself i never ever copied from others. Unfortunately my lecture don't believe that code is made by me. He thought i copy from other person. Oh my god!!! i know i doesn't have "clever face" for show to him like other my classmate...so that not mean that i don't know to write a programming. yaaa..maybe that it not her fault..i just don't know..i try my best,stay up every night and finally i come up with a original programming that i made by my own.I'm very sad because of that. However, i don't mind at all about that,i just keep doing what i doing rite now and keep write a programming.