I hate to see you in this situation. Have you ever taken any feedback from your previous interviews? You might learn where you went wrong.

You have to tell your interviewer that you feel the profession has let you down. Everyone starts a job without experience. Even your interviewer. Let him know that. Then tell him why you have to be offered a position and what change you can bring. Examine what is lacking among your contemporaries and provide solutions how you would overcome. Once I was asked to describe myself. I described myself in three words: ABLE AND RELIABLE and RESULTS ORIENTATED. From that, I developed. I was hired. Google interview techniques. You will find a lot of questions and answers. Also, prepare a few questions to ask at the interview. NEVER leave the interview without asking at least one question. Even if they do not ask you to, impose yourself and tell them you have a few questions for them.

I wish you good luck.