That comes to the core of what I don't understand. When I was 18, I couldn't wait to leave my childhood behind and to get out of my parents' home. My mind was set on girls, drinking, metal, girls, hoping I'd pass my final exams, girls, thinking of what to do with my future, drinking, metal and girls. I actually sold off a great deal of my toys when I left home and it felt like a great burden being lifted from me. I moved to a major town that was as far away from home as possible, and one that I didn't know anything about. Not everything went well, but I'm glad for the experiences I made. Some years later, I saw an episode of what was my favourite tv show as a kid (Ghostbusters) and thought it was incredibly lame. I still like a few things I did as a child, but these are things like Star Trek which were made to appeal both to kids and adults.
Now, I'm not saying this is how you should do it or what you should do. I'm not judging you for liking Thomas the Tank Engine. I'm just comparing my experience with this, and I'm completely bewildered. I don't understand it. And why this irks me so much is because I know there are a lot of kids your age who are just like that. It actually is cool to like Thomas or something similar at the age of 18 today, and I don't understand why. Why is it?