Clear your head
Stop talking to yourself for a moment.
Scan through what you are experiencing in the moment.

Pay attention to your breaths.  Count them if you like.
Listen to the sounds around you.
Pay attention to odors around you.
Pay attention to what your body is feeling.
Pay attention to your muscles. If you find any tense muscles, relax them.
Pay attention to the images that appear in your mind’s eye.
Pay attention to the thoughts that pop into your head.
If you think of something urgent, tend to it.
If you think of things you must do, write notes about when you will tend to them.

You can’t clear your head and read at the same time.  So first read about how to clear your head.  Then do it. 

Don’t expect this to take a long time.  Don't let people tell you more is better.  In this case, more is a bore.   Clearing your head is a lot like clearing your attic.  At first, you run into things you had almost forgotten about.  But after a few days, you will have done something about those things.  By then, clearing your head will probably take less than a minute.

How does this help you relax?   Those things you find in your head are what keep you from relaxing.  Give them some attention.  Schedule a time when you will do something about them.  Then the parts of your brain that are handling those things can relax.  When those parts relax, you can relax.  But this will stop working work unless you treat that schedule as a promise. 

Here you can read about relaxing.  In real life, you can actually relax.  It is your choice.