Samuel Smiles was trained to a profession which was not to his taste, yet he practiced it so faithfully that it helped him to authorship, for which he was well fitted.
Fidelity to the work or everyday duties at hand, and a genuine feeling of responsibility to our parents or employers, ourselves, and our God, will eventually bring most of us into the right niches at the proper time.
Garfield would not have become President if he had not previously been a zealous teacher, a responsible soldier, a conscientious statesman.
Neither Lincoln nor Grant started as a baby with a precocity for the White House, or an irresistible genius for ruling men.

So no one should be disappointed because he was not endowed with tremendous gifts in the cradle.

His business is to do the best he can wherever his lot may be cast, and advance at every honorable opportunity in the direction towards which the inward monitor points.

Let duty be the guiding-star, and success will surely be the crown, to the full measure of one's ability and industry.
What career?
What shall my life's work be?
If instinct and heart ask for carpentry, be a carpenter; if for medicine, be a physician.

With a firm choice and earnest work, a young man or woman cannot help but succeed.