What's wrong with me?

You are not weird. You are just changing with time. Everyone changes as they mature. What they used to value becomes less important to them. What they used to think was exciting becomes somewhat boring. Changes can be good. When you meet other people of similar values, outlooks, beliefs, etc., you will feel connected again. Over time, friends do drift apart. I used to have a friend when I was in college many moons ago. We were like brothers. After we graduated from college, we got jobs and he got married (right away). Naturally, our outlooks in life changed for both of us. He had his life to live and I had mine. We sought different social functions. As time went by, we just grew apart. It does not mean we hate each other or became enemies, we just became "different." So, bottom line...you are not a weirdo. You are a normal person.