I started playing as a child, and no one told me then it is very hard to learn, so I didn’t worry about it. As an adult I’ve heard many people say that, but it’s too late for me to get discouraged by that, lol. Yes, the violin is hard. When you first start playing it doesn’t sound good, no matter how good the instrument is. It’s something you really have to want to do.
I’ve also been told (by a teacher no less) that you have to start by age 6, which I think is absurd. I believe anyone, no matter how old, can learn to play, and the benefits of learning the violin at any age far outweigh any difficulty the instrument may pose. It’s good for the brain, it’s good for the spirit, and it’s good for the body.