Unremarkable by Lizzie K. Foley

Jane Doe is a very ordinary girl.  In fact, she is the only ordinary girl in the town of Remarkable.  Everybody in town is remarkable at something - geniuses at painting like her brother, geniuses at math like her sister, a famous literary author like her father or the world's best architect like her mother. 

But not Jane.

Jane is the only person so ordinary that she attends the public school.
Jane is so ordinary that people forget her as soon as she tells them her name.

Until . . . a pirate moves to town who no longer wants to be a pirate.
Until . . . her grandfather decides to sabotage the new bell tower on the post office.
Until . . . her teacher decides to start giving pirate lessons rather than regular school lessons.

Then Jane Doe realizes that being ordinary is a wonderful thing.