Woes of job hunting

I really really really want to strangle myself. Right now i'm feeling extremely disappointed and frustrated with.......ME..Sigh.
I went for an interview this morning. It was for the post of 'management associate' in a multinational company, Dutch Lady. The interview was held at Damansara Uptown. It only striked me how extremely fortunate i am to be called in for an interview in the first place. It seemed that the amount of resumes received was tremendous. And out of those, only around 15 was considered. And i'm one of them! A one out of 15 chance.
I only seem to appreciate this fact AFTER i have gone through the interviewing process, which is actually a tad too late. When i stepped out of the office building, i was going OH..O..What have i done. Why didn't i try harder to sell myself! I realise now that there was a lot more i could say to make a better impression and guarantee myself a second interview. I should have been more precise. Explain more. Talk more clearly.
In short, i blew away a chance of a lifetime....POOH. Just like that in front of my very own eyes. Oh why didn't i grab the opportunity that was dangling right in front of me. I really shouldn't get so tongue-tied during interviews. It's just that my brain seem to freeze and i can hear the wheels in my head squeaking away when i speak. And then, wait..the squeaking noise...sounds familar..it's MY voice. And so, i hurriedly ended my sentence and smile. Yup, the only time i get to impress people and i did not grab it.
The interviewing process was done in groups. We were divided into two groups and each of us was asked only one question. That's what irked me the most. I only had one question to answer and i know that my reply was too short. Only one chance..sigh
Well, no use crying over spilt milk. If i'm short listed, i would receive a call from them by this friday. Well, i can only keep my fingers cross, and keep looking for jobs. Job hunting is truly a challenge by itself.