How long do you get close to someone as an introvert?

Title ^. For context, I’m surrounded by my classmates most of the time, yet it’s so hard to build a connection as an introvert. Like I don’t give anything much to the conversation and I’m just there listening. I have a few people questioning me why I’m so quiet and honestly, I dont know how to respond. Please give me tips, I really want to get close to my peers but I just dont know how to