Stress, anxiety, depression, tension.

I am feeling a mix feeling of Stress,anxiety, depression, tension.I am s 18 yes old boy. my anxiety is so strong that I can't study at all and doing anything is extremely tiring and difficult. It feels like anxiety is eating me alive from inside.Usually I try to sleep in order to find an escape from it but it didn't works. I feel my heart is racing and heart rate goes high.Although I know that I can study but when I start studying I can't.I feel like cannot do this and want to escape this world or yo commit suicide. I worked hard in my study but in exam I feel that I don't know anything my brain goes blank thus I spoiled my paper to. I isolate myself from the world.I started to avoid my friends even my neighbors don't know My name. I stopped to going college. There are 5 days gap in my next paper although I know that I can complete my studies in time but when I started to study I feel that I didn't remember anything, anxious, depressed. So please help me.