Yes. Get a new job.

Go to Hired or Indeed Prime, list yourself, and watch the offers come in.

This is your first full-time job, right? Some jobs are good. Some jobs are good for a while. Some jobs are never good. It seems like this one was good for a while.

I suspect that as the youngest FTE, there's a lot of internal politics around promoting you. Possibly it involves you not having a college diploma (I assume you don't). So leave. Go somewhere else, where your talents will be recognized.

Incidentally, a friend of mine is 21yo, was hired at 19 as a full-stack dev at his fast-growing startup in SF, promoted, and is now leading a team. I'm sure you guys would enjoy meeting each other. Email me (email in profile) if you want to be connected.