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For example, the most common translation of 내 머리가 나빠서 is 'Because I'm Stupid' but that it means more like 'Because I'm a Fool'. It can also, depending on context how strong the 'fool/stupid' is.
내 머리가 나빠서 (Because I'm Stupid)
by SS501
from the Boys Over Flowers OST
Because I am a fool
The only thing I think about is you
But I know that you are thinking about somebody else
And you probably don’t even know my heart
I probably don’t exist in your daily life
And I’m sure you have no thoughts of me
But for me, I spend my days thinking about you
And my tears keep falling
Just looking at your retreating figure
Is happiness to me
Even if you don’t know my feelings
Even if you simply brush me aside
CHORUS:
In those days when I desperately want to see you
Those days that are so hard to bear
My mouth wordlessly repeats “I love you”
Alone once again I cry for you
Alone once again I’m missing you
Baby I love you
I’m waiting for you
I probably don’t exist in your daily life
And I’m sure you have no memories of me
But for me, I spend my days thinking about you
And create my own memories
For me
Love is a beautiful scar
Even when I see your beautiful smile
I cannot smile with you
CHORUS:
In those days when all I think about is you
Those days when my heart is cold and sad
My mouth wordlessly repeats “I want to see you”
Alone once again I cry for you
Alone once again I’m missing you
Baby I love you
I’m waiting for you
Bye bye never say good bye
Even though I can never have you
I need you
I can’t say a word, I want you
I keep hoping and hoping
In those days when I desperately want to see you
Those days that are so hard to bear
My mouth wordlessly repeats “I love you”
Alone once again I cry for you
In those days when all I think about is you
Those days when my heart is cold and sad
My mouth wordlessly repeats “I want to see you”
Alone once again I cry for you
Alone once again I’m missing you
Baby I love you
I’m waiting for you