Am not sure what does you mean about you put all into it, did you refer to how long you invest to learn Bitcoin or you're used all of your money which is $450 to buy Bitcoin? As long as you can afford to lose all of your $450 and you don't need to use that money to buy stuff in your school, you're good to go.
Does you mean this app?
https://www.stockpile.com/ It's a centralized platform and I see they're ask KYC verification, it's not good for long term holding, you need to use hardware wallet since you're still newbie. Make sure you bought it from official store/seller. Anyway this thread is good to learn
Security and Privacy Topics on Guides and Protection. Yes, I do mean stockpile.com. Also, I will talk to my dad tomorrow or very soon to talk to him about transferring my money out of stockpile and into a hardware wallet. I plan on long-term investing my money into btc. Currently, I can afford to lose all of the 450 dollars of bitcoin that I have. It's not a life-changing amount for me or my family. However, I do plan on investing almost every dime I earn from a job/birthday/holiday (I'm not actually 16 I turn 16 literally next week) I am very excited to get a job so I can get more bitcoin, for me it's like gold, in my mind bitcoin is shiny and awesome looking.