First of all, this is really good! Anyone should be able to understand your sentiment. But here are a few small things you could change. "I overslept this morning." - This sounds more natural. "It's been about two weeks since the semester started" - This is a simpler way to say the same thing. ", but there are already too many assignments." - Using "already" emphasizes the feeling that it is too soon in the semester to have so many assignments.