I cannot relax

It is as simple as this, but it is so disturbing.
I am constantly tensing up my muscles, and i always feel alerted and nervous even when i shouldn't be. I cant relax i have tried so many things. Is there any advice?

As far as I am aware this is called sensitization. Literally feel like you're living on your nerves. Dr Clare Weekes has written books on this subject. It doesn't last for ever, and will go away. Try to eat well, sleep well, concentrate on other things and seek reassurance from a councellor or Doctor.