How should I convince my parents to let me invest?

Hi. Japanese teenager here. I've seen so many people saying that investing was what changed their lives and that time in the market is so much better than timing the market. I'm really interested in investing (although I know nothing about it) and because I have time before I become an adult, I want to start investing. But my parents won't listen to me. I want them to open a custodial account for me but I don't know how to convince them. Also, I want to learn about how the market actually works and how to actually open a custodial account and invest in japan. Can I even invest with how much money I have? (I have a little below 100,000 yen saved up as cash after 13 years of not spending a penny of my pocket savings and otoshidamas) Will that be enough? Please, if you can give me advice here, or give me any knowledge about investing in japan and how to market works (I don't really know so please, PLEASE tell me TvT) please leave them. Anything will be appreciated :))))

edit: thank you so much to everyone who read this/gave me advice. i honestly cant believe that anyone even read my post. And again, thank you, THANK YOU to everyone. God bless you and have a good day/night :DD

by West-Albatross-707