Is it harder to become a doctor or a famous singer/actress?

Depends on your talents.

It's not a matter of harder or easier, using will or effort. The simple fact is that there are a finite number of medical school seats available each year. While there is no upper limit to the number of people who could become famous each year. Getting in to medical school is the hard stopper.

It's significantly harder to become a famous singer or actor/actress. Most people that try, fail. The people that make it typically have powerful connections or have been singing or acting since they were little children.

It takes more acquired knowledge, hard work, and effort to become a doctor. We can listen to almost any interview with today's famous singers and actresses and realize that they have little knowledge. It is arguable about the hard work they put into their craft but I see many more pictures of "artists" partying, getting into fights, licking donuts and doing stupid things than I do doctors. I would guess that the singers and actress do not work as hard as they claim. I see few student doctors or practicing physicians in clubs doing dumb stuff. I therefore would lean toward being a doctor as the more difficult profession

it is much harder to become famous

There are about 1.1 million doctors in the US and far less famous actors/singers. Thus statistically it is much harder to become a famous singer/actress.

If you are intelligent and study hard, it's easier to become a doctor.

Singer or actress. Just looking at the United States: Every year there are thousands and thousands of med students that finish their residency and can be doctors. How many famous singers and actresses are discovered each year. Maybe 100 or less.

Talent is something that you’re born with and it’s not something that you can learn or acquire. As for being a doctor, it takes hard work but an average person can become a doctor through hard work.

Ask yourself this: how many doctors do you know vs famous entertainers personally.