Many people don't realize that they are doing anything wrong by taking your photos. I am not condoning the behavior, but that is how it tends to be. If you never asked them to give you credit and you are not a professional then I am not surprised that they have stolen your work. If I were you I would ask nicely to be given credit for the photos you have taken. If your friends and family are the ones using them, then I doubt they will have a problem crediting you.
I would also look into adding a watermark.
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