It's not easy and it's often harder then most people think.
People often think acting is the same as pretending or lying - but it's not. Acting is a craft and it requires talent and training to be good at it. Actors need to be able to analyze a script, build a character, memorize lines and blocking, take direction and work with a variety of people in addition to being on stage and performing for an audience.. If you're interested in acting, you should look into taking some acting classes and maybe auditioning for a school play or a community theater production. That can give you a better idea of what's involved in the craft of acting.
If you're asking about a professional acting career - yes, that is extremely hard. Again, it's not what people expect.
People are not just "discovered" and given an acting career. It's show BUSINESS. Attempting a professional acting career is like starting and running a business where you are the product being marketed and sold. In addition to the craft of acting you have to understand the business end of the industry - casting processes (agents, casting directors, breakdowns); legal issues (contracts, unions, taxes); marketing (head shots, resumes, show reel, website, social meida) and networking.
And it's a very emotionally challenging career. It is extremely competitive - there are far more people wanting to be actors then there are roles. It's not unusual for a professional actor to book only one job out of fifty or a hundred. So actors need to be able to deal with a lot of rejection and still remain strong. And every acting job is temporary. Getting one acting job does not guarantee that you'll get anything else any time soon. Most professional actors don't support themselves by acting alone. So in addition to talent, training, experience, and understanding of the business, actor need perseverance, resilience, and many other life skills.
So again - it's not easy.