Hi,
You can only teach class to an extent, the rest is an internal thing. A woman can be classy when poor, wearing jeans, working in ASDA, browsing the charity shops, living in a rented hell hole...whatever.
Yes, you can emulate a typically classy look and (I have found I can be classy on days off and yet allow my 'rocker' side to come out) that can be done on a very small budget these days. You can buy some well cut classics in the most surprising places. You can slightly soften your voice (even south London ladies like myself) and make sure you do not become lazy with speech. You can wear subtle yet sultry make-up and jewellery also. These things will improve you and will give you an outward air of class. None are rocket science.
But I am strongly of the thinking that whilst you should always strive to improve yourself, you should not alter yourself beyond recognition. Class is mainly IMO in how you carry yourself. I have friends from all sorts of backgrounds and their level of class most certainly does not bear any relation to where and how they were brought up.
Personally at your age I would simply strive to improve myself as I grow older, but be MYSELF. Charge what you feel you are worth and do not try to become what a rate bracket would determine, in your eyes.
H x