Kids Names And Nick Names Rant

Im due anyday now and my family is starting to nickname my son which I'm not to happy about and have mentioned it. Am i over reacting for saying he's not allowed a nickname? I know that's just something everyone does to shorten the name but I feel like it confuses the child when everyone calls them by a different name. It took my daughter to be two years old to actually remember which one was her Real name and it was so upsetting cause all I could think about was if something ever happened would she be able to say her Real name or would she say one of the 6 nicknames she has. And yes I tried to get everyone to call her the same nickname it didn't work cause some people didn't like the nick name or couldn't pronounce it so I gave up.