I also back what Pish says....I had the same situation with me....I am Julia and my mum HATED anyone calling me Jules...so she would tell them... "Her name is Julia" and Julia it was! I get called Jules now as an adult because I allow it, and people only tend to call me that once they've known me well enough. I always introduce myself as Julia and don't like it when people call me Jules before they know me well.