My first OBE was caused by a heart attack. The others just happened. You are correct. This world is a classroom of learning about ourselves. However, it does not have to be painful or laced with problems. We create those out of our lack of knowledge that we create our own reality. We are the ones that determine our own futures.
Now, you can step back from this world by following the teachings of Jesus. He had it right, but the churches interpreted it all wrong. If you love, forgive, return good for evil, help others, etc. This process will allow you to put aside all the conflicts and chaos of this world. It will lead to an enlightenment beyond your wildest dreams. It may take some time in the practice, but it is completely worth it. Love is the key, compassion and knowledge teach that this whole world is only make believe. You are never in any danger. You are safe and secure at all times. Your body is mortal, but you are eternal. Love