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.
The problem is you are putting all your eggs in one basket and while it could turn out to be great at the end there is a reasonable chance you will end up broke that is why it is never a good idea to go all in especially in something as changeable as bitcoin.
Yes, you have a point in that matter. Putting egg in one basket is not a good idea. It must be spread out in different location, so in the end you will not regret it.