I guess I don't know how to keep a conversation going...

Someone moved into the apartment down the hall and smiled and said hello to me. I said hi back but then I wasn't sure what to say and it got awkward fast. And then we both went in different directions. I had to catch the bus which was even more problematic.

It's not like I have social anxiety or anything. It's just that I "lock-up" in social situations that catch me off-guard. I didn't even know someone had moved into that apartment.

I need to find a solution.