Wrong Channel....

These few days, i don't know what had happen to me....
What my friends talked, i just cannot get to know what are they talking about.... I'm always in the wrong channel....
Why??? Why???
What's wrong with me???
I asked my mum, my mum told me that i'm thinking something very deeply till i'm not paying full attention on what people talking about....
Is it true??? I also don't know...