maybe...but then I feel bad for being in year 12 and not studying.
Some hard truth time, but because you want to do med: every year after year 12 is going to be HARDER than year 12. Year 12 was the EASY part. This and next year are the years to get some hobbies going, develop a circle of friends who you can have good banter and times with, go out to town and make some memories you can look back fondly on when the times get comparably tougher.
It's great that you love studying, good for you and you'll find that most people here don't mind it either, but if that's your life then you need to find other people who make studying their life or you'll always feel like an outsider.
As for conversation topics, I find a mix of new things in sport, cool patients (not applicable to you I guess), stupid stuff celebrities have done, Donald Trump, politics in Aus, old racist Pauline Hanson, future aspirations, movies, relationships, funny shit that has happened in life, bagging my mates (I get my fair share of being bagged too - all banter), and complete random stuff.
Personally, I think talking about academia is a bit of a bore, a lot of my friends study med so talking about med school is kinda *meh* because we're all doing it (could draw an a comparison to a group of mates all doing year 12, why talk about it when you're in school for so long every day?). I find discussions outside of what I'm doing to be more interesting. edit: I should add, I made a handful of really good friends (who I see on a regular basis and go or graduated from Monash/UoM) from AN who all do different things to what I do (eng, sci, comm, arts), so that really helped me expand my social circle beyond med, school mates, and randoms you meet at social events. Might be hard for you coming from WA, but I'm sure you're not the only one on this forum with similar issues so I thought I'd make the point anyway - come to AN meets and meet like-minded people your own age!

I find that if you go into a convo thinking you have to say something, then you'll be just thinking about that and won't actually contribute to the natural flow of the conversation. Granted, I don't consider myself to be an "out there" social animal who gets along with everyone, but if you have the right people around you it shouldn't be a problem.