Different people read at different speeds, and that's okay so long as the fluency and comprehension are still there. Also, a person's reading speed will change depending on what they are reading. If I am reading a light novel, my speed is rather fast, but hand me a more complex novel, one with a jillion characters with difficult names to keep straight, and my speed will decrease a bit. Hand me a textbook where my need is to retain information, and my speed will decrease a bit more, perhaps significantly more depending on the subject. That is very normal and actually good reading skill.

I wouldn't particularly worry about your reading speed so long as you are enjoying and understanding what you are reading. Try not to get into the comparison game with other people. (I go through this discussion with my students all the time.)