Dear Inspired,
I understand your pain. Sorry. I also understand you desire to get right. Take it easy. You are young and in the right place to learn. Even Charlie and Warren have made big mistakes.
Warren, himself, suggested that the best way for a novice to learn about investing is to read, The Intelligent Investor. I’m reading it now for the second time. He said it changed his life. He changed mine.
Jim’s advice to read all the annual letters is also a good way to add to your investing library.
I would also suggest you read, Damn Right, to get a good view of Charlie. Warren Buffett Speaks, is a simple and fun overview of Warren’s thoughts. There are many other books about Buffett and Charlie. Hagstrom’s book, which I haven’t read, and Alice Shroeder’s, Snowball, which I have. Many more.
You might also read, Extraordinary Popular Delusions and the Madness of Crowds, having had a little experience of that, lately, right? Also, read The Internet Bubble, Living Within Limits, and, Influence, to get ideas of books Charlie liked in the past.
Charlie likes to say, investing is a subset of worldly wisdom, so one should develop a latticework of mental models from the various disciplines. He especially likes physics. He says some accounting is useful. Of course, logic. And stoicism is very important to him.
Another technique Charlie uses is to invert. For instance, Charlie might say to you, instead of trying to get rich, think of all the ways to lose money and then don’t do them. Don’t try to be smart–just try not to be stupid. He said when he was a meteorologist in the service during WW2, his task was to keep the pilots alive on their sojourns. Instead, he thought of all the ways that he could kill them and then stayed the h377 away from those.
Learn the difference between investing and speculating. Do you trust the person in the mirror? Instead of getting your confidence back, attain a healthy humility.
Warren says, get rich slowly. He sites the first law of money as, don’t lose money, and the second law of money is don’t forget the first law.
It takes a lot of work to learn all the mental models required to become a good investor. It’s really hard to become a good investor. Really hard. Plus you need the right temperament. Can’t be a gambler because that is not investing. Someone compared trying to be an investor to getting a medal in the Olympics. More people try it and think they can do it.
Benjamin Graham said something like, it’s not so hard to do better than the indexes, but to do very much better is very hard.
So, relax. Stay safe. It takes time to get time. Takes experience to have experience. Be humble, be honest with yourself. Be patient. Whatever you learn here will help you on your journey. Good luck.

P.S. There are great people in the world. Warren and Charlie are two. And there are quite a few here, as well.