I lived in a kinda small town when I first started looking for work. I applied at just about every shop and fast food place and market in town. I was so discouraged when no one paid any attention to me. No calls, no interviews, no nothing.
I was shy, sure, but, always polite and tidy.
BUT, I can say this with some certainty, I would never have gotten any single job I had, without someone putting in a good word for me.
From the 2 seasonal jobs I had, then the 4 restaurant/retail jobs, the 2 professional ones, and my 7 freelance customers... every last one, someone put in a good word for me because they knew me.
One of them, it was really only a passing knowing, honestly. We were at a professional lunch and a guy tweeted he didn't know anyone and didn't want to sit alone, so I told him he could sit with me (ha! He thought I was being nice to him.). To say thanks, he ended up introducing me to his handler later that day, who has since contracted me on small side jobs about 10 times.
Anyway, let your parents friends, or your old teachers or any other social groups you might have an 'in' to... do you have a grandma that plays bingo? have her tell her friends there that you are looking for a job.
Don't have a family or close friend support willing to talk about your job search? Try volunteering for something like a food bank. You'd both find people that widen your social circle, and you might meet supermarket owners or managers who drop off donations.
Best of luck. Try not to get discouraged.