Forget about everything else and just put everything on bitcoin. You are living with your parents, they pay everything for you, you got nothing to lose. If I was living with my parents, I would save everything and buy bitcoin monthly. If BTC doesn't keep rising you can still reach the 21 BTC holder group, then save this and retire in 10 years when the price makes you a millionaire.
Go all in on regret later. You are on a privileged position to profit from high risk high reward moves. No risk no win, and BTC is the best long term high risk bet.
I think the price of Bitcoin is so high that purchasing is a wise decision of young people because of too much risk. When you are young, living with your parents, most of the savings you save are so small that you can invest in Bitcoin. Bitcoin prices will increase or decrease so nobody knows in advance so I do not encourage you to invest all in Bitcoin