How you are feeling in this moment is temporary. You will get past this, and you will find your direction. I know what it's like to be shy and self-conscious enough that I struggle when it comes to applying for jobs. However, you have to be strong and try and push through that. No employer is going to offer you a job based on your looks. Preparing well for interviews by researching common questions, and practicing is the best way to build your confidence. Remember that loads of people are also shy, or have insecurities - you are not the only one.
I also have anxiety that means whenever I am out in public anywhere, or at university, I constantly feel as though someone will be looking at me and judging me. Chances are, no one actually is and it's all in my head. Because of this, I am a little awkward when talking to people I don't know very well. This makes interviews really difficult for me. I know though that I don't want to feel this way forever. I don't want to let it ruin my life. I want to get somewhere and be proud of myself. I try my best to smile and pretend I'm confident when I'm not. It is slowly working, I am gaining confidence as time goes on. You can too.