你（并不）必要是一个艺术家,才能拥有创造力.
注意have to,它是一个一般的情态动词短语,否定和疑问要借助助动词do构成,比如：
I had to go to see the doctor because I caught a cold.
You will have to replace the light bulb.
We have had to stay here for two hours because it is raining heavily outside.
Do I have to use the car park?
希望我能帮助你解疑释惑.