My first question is ... do you want to go to college? You said you chose to not go on because you are too scared. If the answer is yes, then I'd suggest to go to college. I didn't really like college my first semester (but it was for a mixture of reasons.) I even took a semester off before going back to a new school. I like to learn and I am good at school despite me being incredibly shy. My one rule about my shyness (and it's really my only rule) is not to let it get in the way of something I want to do. It's only then that I consider shyness a problem.
I know that I might have more obstacles than someone who isn't shy, but in a way, I think it makes me a stronger person. School, interviews, jobs are harder for me, but you have to take it one step at a time. You have to challenge yourself and make yourself better. I have had a couple part-time jobs in the past. I also didn't get some of them - but I am not sure why I didn't in some cases. I think because I had a long commute, they wanted someone to work different hours, etc. Basically, if you don't get the job, don't take it personally. Hell, I've been so scared trhat I drank heavily before an interview. Very dumb and I think that's the reason I lost a job I really wanted. But, it wasn't what I wanted to do as a career so I am glad I learned how dumb that was before it could have ruined my life. That was a learning experience for me. So, look at the process more as self-growth. And interviews alone can be a great step because then you have an idea of what types of questions that might be asked for the next one.
I am just curious, but what type of job are you interested in?