Really, you can't try to be "nice" or "not nice."
You can only be.
"Nice" or "not nice" is a judgement made by someone else.
Something you can't control.
So, let go of trying,
And just be.
Assuming this is toward me.
If not, no worries, it made me think anyway. You are correct. No in between. I am told I am nice. I am nice.