Find something you are passionate about, work hard, be persistent, and go for it. YC is a great opportunity, and you should be looking for opportunities whenever you can.
But without your own hard work your company will be nothing, and this doesn't change with or without YC.
Yes, it sucks getting rejected from anything, but the only time it's the end of the world is if you give up because of it. My last startup that interviewed at YC, was rejected, and shut down soon after, probably weighed too heavily our rejection (though it was far from the only reason we shut down).
(Disclaimer: I'm a two time rejected applicant, one time rejected interviewee)
About your statement, I don't know. I can't waste my time thinking about that though. I'm really excited about what I'm working on right now and I've learned a ton in the last few years. Going for it is all that matters to me now.
I will be applying again next round though :)
By the way, I've seen one or two outdoor advertising startups pop up here and there over the last year or so ... which means your original idea may have legs. If I remember the names or stumble on them again, I'll be sure to come back and post the companies ... in case you're interested or just mildly curious.
"We still know that chance is there and believe that we can do it. It's always been up to us to prove it, being accepted into YC, or not, doesn't actually change that fundamental requirement. We've got great supporters and more ammunition in the bag still - so it's back to the grind stone again and let's move forward (another thing that wouldn't change whether we were in YC or not)."
Great article though regardless. Oh yeah, and the design/logo sucked ;)
Just one piece seems missing from this article. If you're not doing Adeptley.com - what are you doing now, and do you regret not doing Adeptley?
I mean, also, your website you put up kind of looks like you spent 2 nights on it.