The 30-year-old actor said he was targeted in his boarding school for his chubby features, reported Ace showbiz.
"I was fat. I was Fat Cavill," Cavill was quoted saying in Details magazine.
Cavill said he did not have many friends in school and missed home badly.
"I bawled on the phone to my mom four times a day. I became an easy target," he added.
However, he tried to make friends by performing in several school plays a year. He loved being involved in plays and wanted to keep acting, but his father disapproved.