Is anything in life really true, is it really there? Can you really see what is beyond your own mind?
Perhaps nothing is true- perhaps you're just imagining having homework assignments, posting questions to this site, having people answer you, getting bad grades if you fail to turn in your work.
Even if it's all imaginary, what does it matter? Can you change your imagined world? If you can't, then you might as well assume it's real.