In getting a job

I am confident that I have good qualifications. I have good educational background so I know that landing a job will not really be a problem to me. A week ago, I applied for a job abroad. I believe that the agency liked my resume but then when I was interviewed, the interviewer advised me to lose weight. I know that he didn't want me to get offended and maybe being slim was one of the qualifications of their client. I understand his point and I know that physical appearance plays a big role in landing for a good job but I cannot just fathom that it is such a big deal.I'm not applying to become an entertainer, performer or a model. I love the job that I applied for and I believe that I'm qualified with it except that I'm fat. I feel like I'm such a loser. Almost all my life I strive to be better than others in terms of education but it the end, everything seems useless. I really have to lose weight. I don't want this kind of incident to happen again. It's a big blow to me and it's like someone is telling me, "IN YOUR FACE". This is how fat I am------->>>>