forget about what they think, it is your choice to be a full time mum!! none of their business.
I was once asked by a girl in a mall to do a survey, she asked me what I do, I said I am a housewife, then she said to me, "oh... that means you are unemployed la.." It was kind of sad to hear that cos I was full time mum looking after my baby, which is my job... but I have learnt to ignore other people!!! So, don't waste time to be upset about others' comments.... just be yourself!