This bit was quite interesting:
Even if it's made up, it's coming from a part of me.
I haven't fictionalized things related to others but yeah I do that with information related to myself. And doing that often helps me understand my inner needs better. It is like a voice inside of me is telling me what I really want.
The only others I would fictionalise about is made-up others. Otherwise I would be veering into lies and dishonesty territory.
If I add characters in to little story segments, as I have done with the Notes series, often they are based on real life encounters, and some alterations (for entertainment) will take place - that is I may base it on someone I met, but it isn't them.