May i please have some feedback

Okay so, I used to be what I call highschool depressed I feel like everyones gone through it and as you could've guessed it was over a girl. But I don't consider that depression anymore. I consider being another dumb teenagee caring about stupid stuff. But I want to know what I have now. It's very cool in my opinion my mental state now is stellar because I simply don't care. I would sit under trees all day long at school just thinking about disasters, or shootings or how civilization is pathetic how our society is nothing. There's 7 billion ect. People on the planet and most of us have the audacity to think we matter. I would think of scenerios about my school getting shot up. A pretty attractive girl even asked if I wanted to go to prom, and I said no because it was pointless, one day to be around everybody I hate. I also started to intake so much knowledge of useless things because I'm bored hours on end. I will read into political news, philosophy, psychology, human anatomy, basic quantum physics. I started reading stephen hawking books, and books on human greed. I stopped talking to girls, and pretty much everyone for that matter. I wouldn't do my school work because it was so useless to me that I would literally throw it away. I used to actually be popular...sorta, I mean I'm not bad looking, I find myself actually pretty decent looking. I like going into the woods and just hiking for hours by myself until I don't know where I am and I have to find my way back. I've just changed so. much in like a matter of 6 months. I've also become an atheist. I mean I
literally don't care about anything
except myself. I still try to make
myself look good I eat amazingly healthy. I've written countless stories on suicides, shootings, murders. I've had people read them. Who've said there really good but quite disturbing. I don't want to go to college as I don't care that much about money. I just want to move to like new zealand or ireland or iceland and just hike. But people have told me it sounds like I'm very depressed or insane. Because of the things I say like I'll be sitting there and then just zone out for 10-20 minutes thinking. I used to want a girlfriend and money and friends and everything else a normal teenager wants. Now I just want to be alone. I've even thought about killing myself to just see if there's anything next. Some nights I'll just walk off into the woods at like 10-11 pm just to see what's out there.