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Do you think you can do the job you'd be applying for? You mentioned that your only concern is the interview. If that's the case, then you're holding yourself back out of fear. gh05, are you more afraid of giving a 15 minute presentation, or of spending more of your life in an unfulfilling, mind-numbing job? Look at the big picture. If you apply, and don't do well, it is over within a few minutes and you can look for other jobs. Not a big downside. The potential upside is a more fulfilling job, the potential to learn new skills (CS and otherwise), some excitement, and the pride of knowing that you overcame one of your personal challenges. You could make this a serious step toward a better life.
If you want a crash course on public speaking, you can get it from the forums here. You can start preparing those skills and do in-depth research when you find out your topic. You can do this if you want to.
Even if you choose not to go for the interview, don't spend any more time lowering your consciousness. Start developing yourself. You may find it is practical to continue your current job while you train yourself to do bigger, better things. That's fine. But please don't stick yourself in a life you don't want. There's a better world out there, waiting for you. Go get it.