This is why electroconvulsive therapy sometimes work rather well, people forget about their past life that consisted mostly on failures and thus they are able to move on. Seizures tend to cause memory loss over time and this is in some ways a good thing.
You may think "knowing this is important" but usually you will do just fine in life if you forget it. It's mostly stuff such as passwords you need to remember assuming you have not written that down somewhere (in that case you may need to remember where).