Fragile

Friend,
I wonder if I am your best friend?
You are mine, but am I yours?

Friend,
I think of you when I have happiness to share,
But am I the one you think of?

Friend,
I am offhand and bad-tempered,
But I treat you with sincerity.
Do you treat me the same too?

Friend,
I feel sad,
As the distance between us is increasing.

We've been friends since a long time ago but I am not the one they think of whenever they have something to share. Sometimes, I think that I couldn't fit in, am I an extra? Is it because of my offhandedness? Is it because of my temper? Am I not good enough? Being sensitive, but that's just me.