Forced a significant amount, like a decade. Would you:
a) Understand that in order for things, people, places, etc. to come together as you remember it, you have to relive your life as well as the failures and successions.
b) Learn from your mistakes and change your life. But then when people criticize your new-found perfectionism, you cannot defend yourself as your hell never happened.
NOTE: Keep in mind that even if you are in your younger self's body, you still have your older self's maturity level. For example, you cannot date that girl or guy you liked before as if you were never shy. Your friends might consider you somewhat adult-like and/or boring or vice versa.