How does the Bible apply to us today?

Question: There are many passages in the Old and New Testament that appear to be conversations between individuals or groups of people many, many years ago. I don’t always understand how a conversation between people hundreds of years ago is also supposed to be for me as an individual today. When Jesus was talking to others giving instructions etc., were his words not directed to that particular circumstance or person? How can I understand that all the passages or written words in the Bible apply to me today? I hope this question makes sense to you, because it doesn’t sound like I’m communicating very well. I guess you can see than I’m confused.