Hey,

A mentalist is a person who has a good skills of decoding human behavior by predicting thing going inside their mind.

You need to have a good human interpretational skills and good mind reading capability to flourish in the field as a mentalist.

The best and the foremost stream that will help you to achieve your dream should be psychology. I believe you should opt for psychology as it helps one with the skills required and mentioned above.

Stay focused and work hard. All the best.

Thank you.