I agree the "withdraw" option is not something Canvas has (and as an administrator, that's actually a good thing, for the reasons @PaulNagami outlined).
@KailiCui, while the submission comment idea would likely work, I'd highly recommend that you reach out to your teacher to talk about this. There are many teachers that will not accept anything submitted as a comment, since comments can get around date restrictions, are not checked for plagiarism, etc... Most teachers will be a little forgiving of an incorrect submission being made, but there are times where you really are allowed only one chance, and it needs to be right. Your teacher will be able to give you the most accurate info and could let you know their preferred method of resubmission if they allow it.
-Chris