You may wish to pursue Purity of Heart is to Will One Thing: Spiritual Preparation for the Office of Confession by Søren Kierkegaard.
In The Bhagavad Gita, Arjuna is disturbed by an upcoming battle in which he will likely kill relatives. The basis for acceptance offered by Krishna―God in human form--is to accept his condition in India's caste system, to be a warrior: to fight is what he was born to do.
Like I wrote to a cousin of my late wife: We did not make ourselves and while we may be disappointed by our limitations, we are not guilty of them. "Unavoidable distractions and societal pressures" are not the problem, the problem is to accept who you are, and to be that.
"to dedicate my entire life in doing only one activity" is not an action, it is a passion. That is, it is not enforced by your volition, but allowed by your self when "you" allow your self to be.
Tao Te Ching: The greatest good is like water, it flows in lowly places and does not strive.
Sound of Music: a dream that will take all the love you can give.
Heal from "I would like to dedicate . . ." Why? Maybe you are trying to achieve the wrong goal.