Start your own thing in your neighborhood. There's a serious shortage of dog sitters, you can very easily clean dryer vents for 100 each Check out YouTube and the tools cost about 40. I strongly suggest that when you graduate high school, you go into a trade. Plumbers are making 140K and Electricians can pretty much write their own ticket. Get a skill that nobody can take away from you. Go on Next Door and don't advertise, just write a quick bit about how this great young guy is offering services and put your name and number out there. This way you can't be charged for advertising. You gotta be sneaky kid.

Be your own boss. Since you can not legally drive a passenger without an adult, why not start a lawn business. Lemonade stand. Anything you can do on your time whenever you needed money.

I feel like i'm at the age where I need to learn responsibility, money management, and develop work experience.

I'm a teenager, and I need to get my money up and also get some experience and learn stuff

It's not so much how old do you have to be to work at Nike, it's more like are you young enough? From my perspective Nike wants to keep a youthful cultural appearance, not unlike plenty of other Companies. But to answer your question, 18

fast food

Restaurants such as service assistants or dishwashers positions.