I know i'm speaking from an islamic perspective..but islam is a big part of me. Islam is a way of life.
The whole "i should feel fulfilled in this world", "i should find myself and be satisfied with my life" is this western philosophy of stressing the individual. But in fact, islam calls this fulfilling the "ego".
God already says..that no matter what you have in this life after awhile it will become boring, meaningless, not fun. We always want more! There are so many people who dont have a good stable life and yearn for it all their lives. Because they think, that once they have that they wont want anything else. However, the ones with the stable life get bored of it because its routine. This happens to human beings to show the transiency and meaningless-ness of this world.
I dont mean to give an Islamic lecture. But i just think that the most peaceful and content people in this world are those who are close to their religion (whichever religion it is). For them what they do and get in this world isnt as important as preparing for the hereafter.
And all that i'm saying is easier said than done. Of course i myself am a prey to the illusions of this world. But anyhow, if that sort of thinking is adopted by individuals then there wont be dissatisfaction with whatever you get in this world.