In Drupal 6 you can have a filter
node.uid = current user. How do you do this in Drupal 7?
You need to edit your view, go to the Advanced column (far right) and add a new relationship.
You will specifically need to add the "Content: Author" relationship.
Next, under "Filters" you will need to add the "User: Current" filter.
Now you should be able to filter content owned by the currently logged in user.