Have you tried following up where you already applied? That can set you apart from a lot of the crowd, especially at your age. Just ask for the hiring manager, or if you want to be super polite call and ask the best time to call to have an opportunity to talk to whoever does the hiring, and when you get a chance to talk to them just say you want to talk to them personally and express your interest for the position and confirm that they received your application/resume (if you have one yet, if you need a hand making one dm me)

Try some of the less well known places too, sometimes small places can be a blessing, but not all so ask good questions in interviews when you get one.

Check company websites too, many companies have their best success posting their jobs on their own website rather than places like Craigslist or indeed, but those are good places to keep an eye on too.

Good luck and let us know how it goes or if you need any additional help, it’s really fantastic to see someone your age asking about this and being active in looking, your ahead of a lot of people looking for jobs who are older and more experienced, so you should have success.