Yeah, good idea. Pico-8 is a GREAT place to start, as all the tools are built in. Just draw stuff, and make a simple game! Fourteen is a great time to start -- I started at 16 (long ago)!
https://www.lexaloffle.com/pico-8.php
It's 15 USD if that is affordable for you. Also there are other tools like Twine and Bitsy and such! Doesn't hurt to try!
If you get it, this demo cart from my TOY BOX JAM has a lot of free graphics, sounds, and music to mess with.
https://www.lexaloffle.com/bbs/?tid=36429
I will make a post for BEGINNER'S RESOURCES for PICO-8 so all beginners can benefit. Thanks for reaching out!