If you married a duke, or started working as a binman, I bet you how others perceive you would be an issue to you. If you do a similar job to everyone else you know, it night not be an issue
Work hasn't much to do with it in my case. The people I work with are only a small sample of the people I know. Most of them are members of the same family anyway (I work for a family-run firm).
Among my family, friends and acquaintances... single parents, co-habiting parents, married parents, a pilot, a single tattoo-covered lone-parent dad (a renowned artist and author), a dancer with the Royal Ballet, a 'Sir', an inventor, a pharmacist, a pop star, someone upper-class but v poor, a common-as-muck multi-millionaire, a Methodist minister, several South Africans, someone who coaches actors, a car mechanic, a foreign diplomat and a fair number of bog-standard 'ordinary' people. Where do I start with classifying that lot? Social class is irrelevant to me - I get on equally well with all of them.
The only people I don't get on with are those who look down their noses at those they believe to be inferior, because class does indeed matter to them. Funnily enough, I suspect that all of them perceive themselves as middle class.