I'm kind of shy and been having some weird anxiety over social settings that I should probably see a doctor about. 

I've told my brother that I didn't want to get introduced or mingle with any of his friends before hand, while I sort things out.

Whenever I hang out with my brother, and other people are around or they want to talk to him, I just step to the side a bit and don't talk or even walk away since the convo might take long. 

He'd always be bothered by it tho, and would always tell me to "stop being mean to his friends" It was okay for the first few weeks since I understood his frustration but this week was just terrible. 

We were supposed to grab lunch with the fam and my dad was waiting outside the lobby for us. As we were heading outside, three of his friends simultaneously stopped him, and was engaging in small talk. I started to panic a bit and walked past them heading for the car. But my brother calls out to me and says that I should say hi to them. I turn around awkwardly and meekly said hi to his friends. I thought that would be okay for him but as we stood close to the car, he once again said that I should stop being mean to his friends. I snapped back and told him that he didn't have to introduce me to his friends. We had a heated back and forth and he didn't talk to me for two days. I just cried all night when it happened. I kinda feel stupid for it. 

I just really hate the fact the he ALWAYS assumes I'm doing it intentionally to be mean to his friends,  especially since I've told him I've been having trouble socializing. 

TLDR: I don't want to get to know/be introduced to my brother's friends because of possible anxiety. AITA? 