I want you to give me a feedback. These sentences.

I made some sentences when I didn't speak today class. Please check my sentences. You asked me, "Is wakeboarding difficult?" My answer : I'm afraid that it is too difficult, I think it is case by case.. I mean some people are good at it very easily, but unfortunately other people are not good at it. It will be difficult for them. Is it right grammatically?

It is gramatically correct except for :  '' I mean some people are good at it very easily, but unfortunately other people are not good at it. It will be difficult for them.

Some people are natually are good at wake boarding but unfortunately it takes other people a lot of practice. It tends to be a difficult sport/hobby to learn for most people.