I need your advice...Please click.

Every time I hear hoặc read bad words like (mother f***er, a-hole, f***, etc.)I feel sensitive. Well I say FEW bad words like "shit" 'cause I find it very common and I don't feel sensitive saying it. Also my classmate threw a notebook on my face then my tongue slipped, I đã đưa ý kiến a curse. But he laughed 'cause we were all making fun/joke. And I đã đưa ý kiến sorry to him 'cause I told the curse to him.
I went to my bestfriend and told what happened, she đã đưa ý kiến "Saying bad words is part of growing up."

Yes, I agree. But, whenever I encounter words like those, I feel sensitive. Help?