bang (one's) head against a wall

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bang (one's) head against a wall

To attempt continuously and fruitlessly to accomplish some task or achieve some goal that is or seems ultimately hopeless. I feel like I've been banging my head against a wall trying to understand this math equation. Some people are never going to agree with you on this, so it's no use banging your head against a wall trying to convince everyone.
See also: bang, head, wall
References in periodicals archive ?
He showed an awful lot of ability in training but you just wanted to bang your head against a wall.
He could have used a bit of magic and scored us a goal but again you just wanted to bang your head against a wall.