To a degree I know how you feel.
I'm a 50 year old single Mother. I grew up in a deprived area. I'm a band 2 hospital worker (not very well paid at all). I'm self sufficient and proud!
I recently ended a two and a half year relationship. I ended it for a number of reasons but one of the reasons was that I definitely got the impression that my ex and his friends viewed me as 'less than' them. I'll not include his family in this because they were truly lovely and made me feel very accepted and welcome.
I do have to say though, that I think getting into a relationship with a man who lived in a 'posh' village, amongst solely affluent people, was a mistake on my part. My insecurities about my social status kicked in big time and probably made me quite judgy of them too.
I couldn't stand the fact that the main topic of conversation when 'down the pub' was how much someone was worth or which multi million pound property had just gone on the market. My ex would constantly tell me how rich certain people were, it was all about money. He would never talk about things that his acquaintances had achieved, it was always about how much a person was worth. I don't get that, I really don't.
Ultimately I didn't fit in with his crowd and being around them started to make me feel like I'd failed at life in some way. Now that I'm out of that situation I'm working on bettering myself (not to make money, but to build on my self esteem).
I think we project how we feel about ourselves on to others. I'm intelligent enough to know that if I was secure in my view of myself, it wouldn't have affected me in the way that it did to be around these people.