be full of

be full of yourself

to think that you are very important in a way that annoys other people I'm not sure I like Sarah, she's so full of herself all the time.
See also: full, of
References in classic literature ?
Oh pride of thy race, honour and glory of all La Mancha, nay, of all the world, that for want of thee will be full of evil-doers, no longer in fear of punishment for their misdeeds
Across the threshold of this door lay a skin bag, formed of a goat- skin, that appeared to be full of pebbles.
And a very good way to not define yourself is to be full of contradictions.