For most of the women here, Instant Sexiness Mix A (that’s the default, Mix A) is a great attitude enhancer - with a whip, LOL. Personally I prefer MX134 and MX105 for that for that on-top-of-everything, I can handle it feeling.
If your introverted personality also has a bit of shyness/social discomfort attached to it, I’d recommend Instant Openness (or Scent of Eros, from Love-Scent) to help YOU feel like opening up to people more.
When you said “vertebrae enhancer” what came to my mind is A314 - it’s made for men but a few of us women are playing with it too. It literally improves your posture and makes you stand taller, along with all its other great qualities! Something to try down the road, maybe, as it’s a little more $$ and its use by women is experimental at this stage.