I’ve had conversations with people about “how can you love the news so much? It’s so negative and depressing!”
The best I’ve explained it is first and foremost you need to understand and appreciate we are a deeply flawed creature and there’s a beauty in that. How could someone not love life for that? I am in a dingy alley having a tea right now I can smell garbage, I can hear the drone of the city around me, everything is stained. But if I look up the sky is beautiful and blue, cute girls are walking by, someone is smoking a flavoured cigar.
If you’re unwilling to appreciate it all, you will struggle on appreciating any of it. Happiness is what you make of the world around you and if you are not willing to be happy inside no external event will change that.
The same reasons as from a professional experience. Yes they aren’t going to pull the doctor’s note but neither is work IMHO. What it does is provide more weight behind your words of “hey I’m not just googling this shit. I’m not just an insufferable asshole looking to validate that I am. I’m actually working with a psychologist.”
Friends, just like coworkers, etc. care less of the diagnosis. They want to know you’re working on you because I’d argue writ large people want to see you succeed. A self-diagnosis can help but it doesn’t give you access to all the tools you may need to succeed so from the outside I would argue that official diagnosis matters. It means you now have someone else on your “team” be it a GP or a psychologist or whatever helping you navigate things.