Developing the ability to be able to stand up and express a Perspective that is contrary to the prevailing "Supposed to be;" is one of the major values in all of this.
Start by undoing the underlying assumptions typically inherent in that question. Usually the assumption is that there is One "Life's Purpose." In addition, it is assumed that one's Life Purpose is "out there somewhere." Something predetermined.
Desiderata and Errata pt 2 By Syl Dinada
Desiderata and Errata By Syl Dinada