confused about some things in Crime and punishment

In part 3, chapter 2 we see Razumikhins thoughts being played in 1st person tense while he is being addressed in 3rd person tense. Is this a common occurrence in Russian literature? Also, we see that Razumikhin says that fearful of Dunya (in part 3, chapter 2) because of her poor dressing, and that he wouldn’t have been “afraid” of her if she was dressed like a queen. what did that mean? Like what relevance does this hold to the novel? I also have trouble understanding these pages from Part 3, chapter 5. How does this all relate to Raskonlikov’s crime on the broader scale? How does this relate to the historical context of that era? Is Dostoevsky criticising utilitarian ideology?