"Frustration is the feeling of being upset or annoyed, especially because of inability to change or achieve something." 

Frustration is born out of the inability to solve a problem. Sometimes we struggle to solve a problem because our perception of the problem is a little off. Attacking a problem head-on isn't always the way to go. A detour must sometimes be taken. It's possible to use that frustration to your advantage. It offers you the chance to reset your mind and attack the problem differently. Frustration is there to tell you that something is off and I need to fix this a different way.