Why do I feel shivering, my heart is pounding and I want to die as long as I get a phone call or a text message from my tutor?

Maybe it's because you made some mistakes, or because you are introverted and not good at communicating with people. I think, in fact, every tutor wants to establish a good relationship with his students, so you might as well take the initiative to contact the tutor when you have nothing to do, on the one hand, to increase mutual understanding, on the other hand, to alleviate your current symptoms.