Answer:
Sonnet 29 shows the poet at his most insecure and troubled. He feels unlucky, shamed, and fiercely jealous of those around him. What causes the poet's anguish will remain a mystery; as will the answer to whether the sonnets are autobiographical.
However, an examination of Shakespeare’s life around the time he wrote Sonnet 29 reveals two traumatic events that may have shaped the theme of the sonnet. In 1592 the London theatres closed due to a severe outbreak of plague. Although it is possible that Shakespeare toured the outlying areas of London, it is almost certain that he left the theatre entirely during this time to work on his sonnets and narrative poems. The closing of the playhouses made it hard for Shakespeare and other actors of the day to earn a living. With plague and poverty looming it is expected that he would feel "in disgrace with fortune"