Is keeping a real diary hip?

I have been reading The Diary of a Young Girl (finally) and it got me thinking.... Ever since I have moved to Cali I don't really have anyone to talk to (other than my bf) about serious issues. I mean I love you guys and the internet but nothing really personal and one on one. So I was thinking of having my own diary to write in the personal delemas of my everyday life. It won't be as interesting as this I can guarantee. Mostly might be me complaining that I am fat ha ha. But it might also motivate me.

So to the point of this post should I? I mean I am a 22 year old adult would be having a diary be to childish? How many of you guys still have a diary?