I feel like I'm between reality and insanity?

I feel like i'm being eaten up by the barrier between insanity and reality, like i'm being slowly disconnected from reality. There are things i want to do, and things that i encourage myself to do because i have to do them but i'm unable to do them because i can't feel myself anymore. I feel like when i look in the mirror it's not myself that i see, when i think it's not my thoughts i'm thinking. Sometimes i even get overwhelmed that everything is real, and humans exist and that i'm actually living, that i'm trying to remember what i felt like before birth. I don't get why this is so, and i really need my concentration because i'm having my midterm exams right now although i feel no pressure of them on myself since i don't find them hard and i usually get pretty decent grades.