My first comment would be to get an education towards a profession first
No reason not to do some side projects at the same time though.
When I was Your age, I spent considerable amount of time doing research and some crude prototypes of active guitar pickups.
EMG was about the only one at that time making 'em, and it seemed like a good idea to make some.
The popularity of actives was already spiraling downwards in the mid/late 80's, and the cheapo active electronics
was driving people away from anything associated with the word active, so after a feasibility study I decided not to pursue that venture any further.
I did consider pedals, or "effects" as they were called back then as well, but the ones played, endorsed and advertized by our idols were so cheap that no-one was able to even match that, let alone compete.
There's a catch though, there always is.
If You can hook up with someone who hasn't made it big yet, and they will use and promote Your
stuff, and continuing to do so after they break through, there's your chance. At Your age it's even somewhat possible, at least 1 out of 1000 kids will make it at some level, and getting in touch with 1 or 2 thousand shouldn't be a problem these days.
If You can make some prototypes, someone certainly will use them, and if they like them they may even give you some money for your efforts.
Since You're quite literally re-inventing the wheel though, the packaging or sturdiness has to be the thing setting them apart from the competition.