being antisocial on the internet

I can already guess what you're thinking: I'm the biggest loser in the universe if I'm antisocial on the internet. In which, you're probably right, but let me explain my whole issue.

This happens a lot to me when I join new platforms. I'm a little lost, and I have no clue what I'm doing. I'm seeing all these people creating blogs and groups and I desperately want to fit in and talk to somebody, but I have absolutely no idea how to do it. 

Maybe I'm just wondering if anybody else has this issue? And maybe some tips beyond, "put yourself out there!!" because lord knows I'd completely embarrass myself.