Psalm 28:3-4
3 Do not drag me away with the wicked,
    with those who do evil,
who speak cordially with their neighbours
    but harbour malice in their hearts.
4 Repay them for their deeds
    and for their evil work;
repay them for what their hands have done
    and bring back on them what they deserve.

The Psalms are nothing but brutally honest! I’m not entirely sure that this attitude is exactly what Jesus was after when he said forgive your enemies, but let’s not kid ourselves, it’s what we all think isn’t it? If not later when we’ve had time to reflect and calm down, but in the heat of the moment. I remember being harassed by a driver who insisted in driving almost into my boot along the A10; the feeling of satisfaction when I later saw him pulled over in a lay-by by the police was immense… Perhaps it’s better to be like the Psalmist and tell our Father what we’re feeling than take out our anger on others. To respond to tailgating with road-rage helps no one.

Bring your frustrations and anger to God, don’t pretend to be someone you’re not or hide away your feelings – he knows them anyway. Pray that he’ll help you to deal with it, and to deal with the people and situations that have caused it in a right way.