It builds up over time, as you get to know people. DeviantArt's like a huge community (city sized). You start commenting on people's work that you like, posting some of your own, and participating - and you'll find that people will be talking to you a lot.
My problem is I have only a limited time I can spend each day doing this (for example, today is a holiday - I don't have to work). I'd like to comment more than I do - it's just a matter of finding time.
From your journal entries, it sound like you're still in school, love to write, and maybe a little bit bored. Writing is wonderful - you should go for it.