Yeah haha started med school when I was 17 and I'll be 22 in two weeks so.. It's not like I began a lot earlier, that's more or less the average in my country

About extra-curriculars.. well.. first years it's even harder to do that, maybe because you are getting use to your new life.. and i don't like clubs so that's the easy part. I've been involved in scientific research since 2nd year but I don't know if you find that interesting hahah, But last year I took a decision and organized and join the climbing club at my college so I guess it's about organization. If you want something you'll get the time. Remember that you'll always need balance.