Not sure why you want to get over it, but to avoid doing the "XY Problem" thing, and answer your question as-is: Maybe the problem is self-limiting? There's only so much information about old OSs out there. Once you've spend a hundred, or a thousand, hours on reading about old OSs, maybe you'll eventually get bored, and be free from this obsession? IDK, I'm also obsessed with the same thing (shout out to me favorite old OS: ChorusOS!), but I consider it a relaxing hobby, not necessarily a waste of my time.

If that doesn't work, perhaps you could make this into something useful. Blogging about something you're passionate about is a good way to signal to people that you're generally an intelligent person, and can help you get jobs, etc.