I read a lot of spiritual texts, but I still have so many doubts. Why does the Satcharitra say a Guru is necessary to remove ignorance? Can't I figure it out myself?

Chapter 50 directly addresses this situation. It explains that ignorance often manifests from doubt (vikalpa), and this cannot be removed without a Guru. The text warns that when doubt enters knowledge, even a person who is otherwise wise can become prideful and deluded. Using a powerful analogy, it states that just as a single drop of fermented gruel can ruin a whole pot of milk, a small doubt can corrupt one's understanding. Therefore, as Chapter 50 explains, a Guru is essential to help remove these doubts, purify the mind, and allow true, infinite knowledge to manifest.