Three weeks ago I applied for what I thought was the perfect job for me. I researched the company for hours, got familiar with the team and their roles and spent ages writing a covering letter. I had the job/person specification in front of me and ticked off each and every point as I went along. I submitted my application 2 days before the deadline and received an email to acknowledge that it had arrived. I wasn't 100% sure I'd get the job but I was very certain I'd be contacted for an interview. However, this was the week that interviews were supposed to take place and I haven't heard a peep, so can assume I was unsuccessful 
My confidence hasn't been great for a few years and this has really knocked me because I was so sure this was something I would be good at. I can't think where I went wrong and it's really bothering me and making me anxious about applying for anything else. Would I be unreasonable to ask them why? I don't want to be annoying but surely there must be some reason?