Ok great.
I believe the OP came out of the poster's preoccupation with how others (and not even any particularly nice 'others' who are worth worrying about) perceive her in particular, rather than out of any general opinion about "Essex girls" and whatnot, if that helps.
In my personal experience, while I'm sure Essex has the same sort of mixture of people in it that everywhere else does, I've only ever met very lovely and genuinely nice people from there. Lots of smart women, too. That whole "reality" show thing about Essex was really annoying because it was quite boring but everyone seemed to go bonkers with adoration for the women on there who were clearly pretending to be as unintelligent as possible. And it makes me sad when women feel like they need to do that to seem "nice" (rather than clever and therefore "evil and calculating").
To get rather more back on topic, with escorting (as with any marketing), it can be effective to have a persona/character. Not a mad stereotype that you have to adhere to strictly or anything, but just a general outline that makes it easier for potential clients to feel like they understand you and know about you (because people tend to relax more when they feel like they're in a comfortable environment, and will generally respond positively to the familiar). When marketing using personas, it's a good idea to make use of positive aspects of a stereotype, but emphasise your individuality when refuting the negative aspects.
And then, once you've finished doing that if that's something you wish to do, turn your attention to a nice book rather than spending any additional minutes thinking about other peoples' assumptions because those (and all) subsequent minutes are precious moments in your life that should not be wasted.