When I was in primary school, there was an excursion to an ice skating rink. Having lived a fairly sheltered life, I had never skated before.
"No problems", says the teacher, "just walk around the rails until you get the hang of it" and off they go to enjoy themselves.
Fear of falling or just looking silly (ironically), I clung to the side in desperation with each precarious step. I would love to tell you that by some miracle I sailed off and pirouetted my way to success, but this was not the case as I spent the whole session on the sidelines.
In some ways, this reminds me of your current predicament...
Without the support or encouragement, what else could I do? - someone needed to give me a shove or hold my hand in the first instance, but that support just wasn't there.
You need someone to believe in you also, whatever job you apply for. Oddly enough, one of your skills is your anxiety as you will be finely tuned to the responses of others; another is your age and capacity to engage in work without bias or expectations.
The thought just popped into my head that you might be good with children, having sensitivity to their needs. If too confronting, how about working with animals - same attributes but with less shouting (:)).
While most things require some qualification, studying while working in the field is far more manageable as one justifies the other.
Finding something you believe in is a good way to step over your anxiety - it doesn't go away, but just takes on a lesser priority.