£600000 Isn't going to last you long
This!
600K isn't that much in this day and age. In your teens it seems like a lottery win but 600K from 21 until death (assuming you don't manage to kill yourself beforehand) won't last. Especially if your not working because boredom will lead to spending. You'll spend spend spend, run out of money to fund the spending, sell what assets you have to keep up the spending and probably die in a pool of your own filth with a syringe hanging out your arm.
Enjoy

Now for option 2. Spend a bit, save the rest, get a good job and retire at 55 with a good 30-40 years of great living to look foward to and no worries of spending your last days in an NHS home - again probably sat in your own filth.