Hi Rebecca, I'm the queen of the post it note (as in "keys, wallet, phone, travel card" note on my front door as I've been to the shops, loaded stuff on the checkout and then remembered...no wallet).
I think isolation is probably the worst thing for the lack of confidence that being forgetful brings. I do (force myself to do) some sociable classes that have a mixed range of people. The older people are very understanding about being forgetful, including of their names (they often can't remember mine either). Make a joke of it.
Try not to let it shut you off from having fun. X