This question is actually very easy to answer. Imagine that human's previous knowledge of the universe was centered on the earth. Humans don't feel how small they are. We are the spirit of all things, and we are very proud. It's like you're in your town. Your reference is the best person you have ever met. When you walk out of town and into the city, you will find that the center of the universe is not the earth, but the sun. The people here are ten times stronger than when you were in town. When you walk into Beijing from your city, you will find that the center of the universe should actually be the Milky Way, because there are hundreds of times more powerful people here than you saw in your city, so you feel even smaller. When you go out of Beijing to contact a higher class or have a broader perspective, you will find that the Milky Way is so small. This is the change of cognition. You will feel more and more lonely, smaller and helpless, and feel really uncomfortable staying in a small town, so you begin to miss your feeling of youth and ignorance crazily. People's happiness comes from confidence. Please understand my words carefully.

So the biggest difficulty of drifting north is how to overcome the strong sense of loneliness and loss brought by the impact of this reality on fantasy. Once overcome, find a set goal and go on step by step. Even if you want to be a star or a scientist, although there are many so-called dark sides, to accept these dark sides and turn them into rising skills, one's strength can't compete with the environment. Even if you don't succeed, you will definitely be better than mixing in a small city.