To answer your original question, I haven't felt exactly like that but I see where you are coming from. I'll offer my personal experience/thoughts, because hopefully it will help, but if not don't worry since everyone is different.
I got super into coasters when I was about 12, and they were my number one hobby for a couple years. I would go on several websites, researching, looking at pictures, keeping up with news, and of course going to Carowinds. It helped that my best friends at the time also loved Carowinds, so we went a lot.
Then, as I got older, I had less free time to focus on coasters (I got other hobbies, got a job, took AP classes, etc.) and on a couple of occasions I wondered something like "Am I losing my passion for roller coasters?" But really, I wasn't. A couple of ways I could tell: The idea of traveling to a new theme park still excited me A LOT. Any time someone mentioned a coaster or park I immediately get excited and wanted to join the conversation. These kinds of things can be signs that you still have a strong interest in coasters, even if they're not your number one obsession you think about 24/7.
Now, I pretty much only go on this forum and Twitter for coaster-related content (unless there's some specific coaster/park/rumor/news I want to look into), and I sometimes go weeks without really thinking about anything coaster-related. But any time I get the opportunity to travel (school breaks pretty much) I try really hard to go to a park. And I still talk about them a lot
I'm even an ACE member now!
You may be in the same situation, or you may have legitimately lost interest. Either way, it's not a bad thing. Things may change again for you in a few years. I will say things can change quite a lot when you're older and you can make more of your own decisions regarding travel and you have your own money and things like that. Hope that makes sense. Sorry for the long post, but I may have appreciated someone sharing this experience with me when I was 16.