Confidence to me is competence to manage self image.
Interesting description, I don't wholly agree though, I've found confidence to be two parts, your care, and their care
"How
you care of
them caring about you"
+Confident alone (Care, ...)
+Confident with family because you know (or believe) they care about you (Care, care)
-/+Nervous as you're uncertain whether they care about you, you subconsciously play it safe (Care, care?)
-Not confident with people you know don't care about you (Care, no care)
+Confident while drunk, as you cannot care (No care, care?)
+Confident as you don't/can't care about them (No care, care)
+Confident as you've convinced yourself they care about you (Care, care)
+Confident as you've been through worse, caring pales in comparison (Care?, care?)
+"Confident" as you're simply acting before thinking (...Care, care?)
Your certainty of their care can affect your confidence, if you care a lot you might worry/want reciprocation, -/+, (Care, care?)
Nihilism could certainly boost confidence (No care, care?), which with your description I don't think would apply
I think your description is an overall logical degree or two above mine, not as fundamental
Yours was intriguing and I applaud it, I feel it's cobbled from seeing people look good, them being confident, resulting in a conclusion "they're able to manage their self image competently"
Anyway, this story is eh, ch7 friend praises her being a virgin, so emphasis on virginity is acknowledged, ch13 friend is found to be at least sugar dating, possibly being a prostitute, I'd imagine to secure her as a non-rival to fmc, needless
Dropping at ch15, nice to see informing comments of no progress