I didn't really keep a diary. I've always attempted to keep diaries, but I always forget or I can't be bothered. I'm one of those people who really should write stuff down, but I never do. I've always lived in the kind of household where the idea of privacy is a joke. One time when I was like 10, I had a diary for like a week, and I gave up on that when my friend came to my house and read it while I was in the bathroom and found out I had some silly crush on a boy in our class and she went and TOLD HIM. I know I was only 10 but I was super embarrassed by that incident and I think that's why it was many years before I tried to keep a diary again.
Then when I started at uni I was in a dark dark place, so I started writing stuff down but then I'd read it back and it freaked me out so I chucked it away. Lately though, I've been writing memos on my phone to myself that kind of amount to a really brief diary. I tend to write these late at night. It kind of acts like a sieve to my thoughts so I can sleep rather than being neurotic old me and lying awake at night worrying about pointless stuff. I don't know, I've always admired people who have the patience to write faithfully in a diary all the time. I bet they'll make good reads when we're all old biddies and we look back at stupid stuff we wrote when we were teenagers.