Shoot oneself in the foot.
Be unrealistic.
Ruin something
Be very angry.
Have itchy feet.
An old head on young shoulders.
Want to travel or do something different.
Have eyes in the back of your head.
Be up in arms.
Behave too seriously.
Bang your head against a brick wall.
Struggle unnecessarily.
Give up your plans.
Not to show emotions
Know everything.
Have one's head in the clouds.
Get cold feet.
Keep a stiff upper lip