Is it weird that I call my girlfriend princess?

My girlfriend and I have been together for a bit over 2 years now and we love each other a lot. I started calling her princess because, well, she is my happy ending and she's the girl I want to spend the rest of my life with. She hasn't said anything about it specifically but she seems to like it :).
I go to university interstate and I brought her to meet my family and my older brother gave me a hard time about it, I just brushed it off because that's what brothers do, but do you think this is weird?
Yeah, it's normal
Not normal, but no problem
It's weird, stop now
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Is it weird that I call my girlfriend princess?
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