Apparently, when individuals grow and begin to realize who they are, certainly they start to think of what they really want to be and achieve in contemporary life. Initially, they'll desire to identify with societal norms and engagements. Some may follow happenings in the society or literally decide to chart their different orientations to make a difference in life. Therefore, the major reason you find different people pursuing different desirous activities.
At the age of around fourteen years, individuals begin to know who they are and what they want in life. Some may aspire to achieve certain things in life that may include, education, career, social and economic orientations amongst other things. The most immediate one for most individuals is to excel or acquire some level of education depending on the socialization aspect within that society. However, it is impeccable to realize that even in societies where education or related development is not taken seriously, one individual may decide to do things differently to break off from the norm. Hence, whatever one may decide to do in life is normally informed by what the individual wants to be, though not all that we plan to do in life automatically materializes which situation then leads to regrets.
It is very normal to have disappointments in life. Few individuals are endowed with the luck to go full scale in terms of their dreams.