The pain caused by sitting still

Pain...when doing a session of zazen there always be pains.
It starts with leg numbness and process to sharp pain with fear that legs would have injury.
By time passing once give an attention to the pain,it starts taking control whole mind.
To avoid the pain,starts to waiting finish time and counting left minutes.

Actually the pain is can bare but the fear that legs would have a blood stream problem if sitting still.
But if you could cut the circular fear, the pain would calm down.
Pain is like a wavelength, if there is an antenna it can take charge and begin to turn on.

So important thing is,focus on breathing but this breathing is not easy.
It can keep on minutes but brain keeps bring in a past memory that related with breathing.
You can't realize you are distracted from simple breathing when you didn't cut the breathing related thoughts.

Pain is necessary result it should not be a reason to avoid,without pain you can't see what your brain giving to you.