I hear you. It can be hard to meet people in person -- especially now, not knowing when this pandemic will end and needing to socially distance from people we don't live with.
Most dating apps have an age limit, as you probably know, and are 18+. As frustrating as this can be, it's important for safety reasons -- with the ages of people on the app skewing older than you, it's important to protect against predatory behavior.
That being said, being young doesn't mean you don't want/need/deserve opportunities to flirt and date with others your age! Rather than dating apps, have you considered online forums that can be more age-specific? There are Reddit threads for this, for example, like r/TeenDates and r/TeensMeetTeens. As with any online forum, it's really important not to share personal information with anyone you don't trust -- so don't forget to exercise caution. <3