Feeling

How can I escaped from this feeling
It inside me, through me and have been part of me
Absorb within me without me noticing it
Bit by bit, little by little
Can't erase it, can't throw it away
No word can describe it
It's not like A nor B and C
We used life to taste it
Sweet, bitter, sour or tasteless
It can be pretty and ugly
Like hell and  heaven
Part of it, only we know it