What is the main conflict in I Go Back to May 1937 by Sharon Olds?

I Go Back to May 1937" is concerned with exploring the relationship between wife and husband, parents and children. In this poem the speaker travels back to a time just before her parents' marriage so that she might warn them of the mistake they are about to make. Although the speaker knows her parents will face pain, she cannot stop their union, since to do so would deny her own existence. She wants to live and so these people must be permitted to marry.