What's going on?

This is making me uncomfortable. Two Sundays ago...
My Cousin- "Are you okay?"
Me- "Mhm! Yeah!" [Weird, awkward look for a moment]
My Cousin- "Are you sure?"
"Me- "Yeah."

The rest of that night was really uncomfortable for me. I couldn't wait to get home. And the worst part, he kept glancing over at me to perhaps, make sure that I'm okay. I get irritated when people are concerned. I don't know why.

This Sunday...
An uncle at church- "Is everything alright?"
Me- "Mhm, yes."

I tried to let it go the first time. I didn't think anything was wrong. And I eventually got to ignoring the problem. Have I completely convinced myself that nothing's wrong? I thought I did, but I guess not. I don't know what's wrong. I just don't know. One of my friends told me that I've been seeming emotionless. But I don't believe that. Can on really be emotionless? Is feeling numb, emotionless? Wait I feel stupid. Is it correct to refer "numb" as an emotion? Oh and why is it always Sundays?