What is the song title for these lyrics

Tough in the center, never questioned, got a spine, walk into the room, heads turnin' on a dime, diamond in the rough, workin' my way up, no, you never thought that I would rise to the top. Takin' what is mine, don't need your approval, don't give a damn how you feel, I'll get there on my own. Armor made of steel, I'm a fighter....