What is your own loneliness like?

I don't feel it often but when it happens, it feels sad. Craving for an interesting conversation, seeing someone else's smile aimed at me, wanting to laugh with others... It usually happens in summer when I hear other people laughing somewhere in a nearby apartment and wish I could have fun with a group of people too. I don't feel lonely when I'm all alone, just when I'm around other people and all of them are either strangers or I feel no connection with them.