One possibility is that Shakespeare was simply trying to capture the existential angst that is inherent in the human condition. All people, at one time or another, grapple with the question of whether life is worth living. Shakespeare's words perfectly encapsulate this struggle.
Another possibility is that Shakespeare was writing about the specific plight of the characters in Hamlet. Hamlet is a young man who is faced with an impossible choice: whether or not to avenge his father's death. Shakespeare's words could be seen as Hamlet's way of weighing the pros and cons of his situation and trying to decide which course of action to take.
Finally, it is also possible that Shakespeare was simply writing for the sake of art. "To be or not to be" is a beautiful and memorable line that has stood the test of time. Whether or not Shakespeare had a specific meaning in mind, there is no doubt that these words have resonated with audiences for centuries.
Ultimately, the meaning of "to be or not to be" is up to each individual reader to decide. There is no right or wrong answer, and that is part of what makes this line so powerful.