A short while ago I got a question from Izzy who asked.
How can I convert to Jewism if I’m 14?
The technical answer is you can convert at that age but practically I doubt it will be possible for a Rabbi to start the progress with you as converting is quite a serious choice you have to make.
With that said there is nothing stopping you right now from going to a local Rabbi from the branch of Judaism you wish to convert to and speaking to them, getting used to the culture and learning much more about Judaism so you know you are making the right choice.
It also worth saying that your local Shul quite likely has evening lessons about Judaism (and possibly Hebrew) where you can learn a lot more.
Remember there is no harm at all from having an interest in Judaism at such a young age – I did as well!
Kyle ben Avraham Avinu (קייל בן אברהם אבינו) (2017) Converting to Judaism at a young age. [online] Ask a Jew. Available at: https://askajew.co.uk/question/contacting-to-judaism-at-a-young-age/ [Accessed 26 May 2022]