I wouldn't be okay with therapy to be this way either... as for 'let's end' 20 minutes into the session?! If my T said that to me I'd be furious. Even if he was joking I wouldn't find that funny. Sometimes we 'don't know what to talk about' because we don't know where to start, but it doesn't sound like he's encouraging you to open up. From what you say, he just doesn't seem like he is being understanding and supportive of you... or that he can be bothered at all! Hope you can find a T that will be