no friends at 22 | trying to enjoy my own company 

You know, looking back on being ~22, it many ways it was a lonely time of my life, too. I had to spend a lot of time traveling at that age for work. I lived in New York, but worked in Pittsburgh and Washington DC which are many hours away. I was constantly driving between cities and would spend entire days alone with myself. I'm pretty social on my own, but the work required these long, long drives alone. And then I'd arrive and work crazy hours, often alone in the office and I had to focus and do so much work. It was a tough age. But I value the time that I got with myself for a few years there. I listened to a lot of books (on CD) back then. I grew my career, built professional experience, really developed who I am as a person. In some ways it was a very tough time. In others, it was very valuable and not really a bad thing.

Also correct: the doctor's appointment. That's exactly how we say it (USA.)

Can we be friends!

Yes, you say Harry Potter and the Prisoner of Azkaban correctly.