beat (one's) head against a stone 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 beating my head against a stone wall trying to understand this math equation. Some people are never going to agree with you on this, so it's no use beating your head against a stone wall to try and convince everyone.

Common Names:

Name	Pronounced	Usage
KlytiË	-	Greek Mythology
Laurel	['lɔrəl]
Shonda	SHAWN-də	English
Adjoa	-	Western African, Akan
Sevastyan	-	Russian
Rostom	-	Georgian