First of all, let me say you're certainly not alone in this. I'm 21 soon and I've never had a 'real' job last more than a month. As I wrote in another thread, I've had one job last one month, the next last one week, and the next last one day. So in other words I've never really had a real, respectable job. I also moved around a lot when I was young and went to half a dozen different schools before I graduated high school, so friends came and went and there is only one true friend that has been there for me over the years, and she lives in Scotland. My point is that you're not alone in thinking you're alone.
Have a look at <a href="http://www.tfproject.org/tfp/showthread.php?t=70591&highlight=things+falling">this post that I made a few months ago</a> and see if it helps you at all. I wrote it when I was feeling down and a lot of things have changed since then partly because of support from this board and partly because I kicked my own ass and said 'Just do it, no more excuses.' Since then I've studied a lot and worked out, become more of my own person, all that stuff.
Anyway, to get shift the focus from me:
Do you attend university or a college or any form of tertiary/further/higher education? Remember that it's hard to get a 'good' job these days without even a basic university qualification so it might be something to look into. You could start off by doing something that you know you will enjoy (computer science, history, art, etc) rather than something that will guarantee a job and see how it goes from there. Remember that the goal of everything is happiness: people say they need a well-paying job because it ensures financial security, but that really means personally happiness. If you can get that personal happiness through a course that you enjoy then you're a step ahead.
So look into university or college before starting a dead-end job.
Also, I really hope I'm not out of bounds by saying this, but hearing disabilities and hearing aides are so common these days that most people don't even think twice about them. People won't dislike you because of them, if anything you'll get annoyed because they'll go out of their way to help you. Forget about that hearing aide as a problem and think of it as part of you, which is what everybody else does. We see someone with a hearing aide as someone who can hear us in most cases. Nothing more and nothing less. And the times that they can't, we'll speak louder and more clearly, we'll get our point across and that's that.
Your parents seem like fantastic people. They obviously love you and want the best for you, and now that you're old enough to tell them what's best for you it's time they stepped back and supported your decsions, instead of you putting up with theirs.
I also just want to say that your post and our repsonses aren't end the end of this post. Everybody who responds here wants to be updated on your progress, and wants to know if their adivce helped, and wants to know how you're doing. Even if you get a thousand replies to this, please don't forget to keep us up to date!