I hope you realize that those "multiple mental illnesses" are just part of being a normal human. We all go through what you described, but somebody is making a living from telling you they're mental illnesses.
Every generation feels like you believe yours does about the state of the world, being depressed, and having to clean up the mess from prior generations. I'm an old Gen X and I felt exactly the same way at your age.
Honestly, you sound like based on these faux diagnoses, that you have some kind of defeatist attitude, or a simple inferiority complex, possibly not for just yourself, but for your entire generation.
The good news for you is that I'm here to tell you that you're perfectly normal, or at least based on what you've written, you seem perfectly normal. You also seem, to me at least, intelligent and well spoken, so you're miles ahead of most people in this world. So suck it up and get on with life. It will be what you make of it, and changing your attitude can turn your reality around 180 degrees. Trust me on this, I've been there and somehow managed to survive and even thrive.