Well... ppl who don't log in CAN see "who's online" but their only screen names... _Sky... unless I choose to let someone know who I am, no one knows... out of how many millions of ppl on the internet (and far fewer who read here.)
It's quite natural, imo, to want to double check things...and you pose good thoughts that help keep you safe (especially when on another site.) Please be assured that if anything else were to jeopardize our safety here, DocJohn would fix it! He's very protective of this site, and it's members.
Take your time acclimating. Feel free to voice your fears in the future...that's what the site is all about.