Hi!
I can kinda understand how you feel, i was really lucky and got to see Mika live for the first time a few months ago, it was just totally luck, i only got the ticket like 2 days before the concert!
Up until then i never thought id get to see him, now though i dont think i will get to go again, but then i guess i have to think myself lucky that i got to see him at all.
And as for the posting thing it can be quite hard as a newbie to know where to start but i say just go for it, once you ve posted a few times you get to know people on here more, and as for not being able to keep up with things on here, its totally impossible! and its very addictive to try!