Should I write them down? My therapist said that I use my imaginary friends to fill the void for friendships and help me act out things I couldn't/shouldn't do in real life (risky sex, drugs, partying, etc).

I couldn't write out things we do because I think it would be embarrassing to read five years down the road, but I'm scared that I will forget about them. They've been with me the past seven years and I know someday I will move on, but I don't want to forget what they look like or what they were like. How can I still remember them five years down the road? What should I do?