You probably published a DMARC policy with your own email address as the reporting address (RUA). That has the potential to flood your mailbox with DMARC reports which are not meant to be read by humans. You normally use a DMARC reporting service that will parse the reports and display the aggregate data.
Until you have time to correct the address in your published DMARC policy, you can use the XML To Human tool at dmarcian.
They have other resources for learning about DMARC and a community forum.