So embarrassed

After I have paid my shopping on my way out a Lady security stopped me it was the first time a security opening my goods I purchased searching them in front of other customers and when I asked why she told me its her job I mustn't ask her a lot of questions I felt so embarrassed being searched in front of other customers while they are walking out of the store with their trolleys without being searched. I went to a male security asking him why my trolley is being searched while letting others walking out they must try and practise consistency its so embarrassing being searched in front of other customers as if I stole something in the store. Am also working in retail industry.