So simple - if you have talent - don't make it choice. Pursue your art and be pragmatic about your life choices.
You ask a very straight forward question with a multitude of answers. The simple and most basic answer is that anyone can be an artist just by making art. Whether that's painting, drawing, writing, dancing, making music, etc.
The more difficult answer, and what I think you might actually be asking is how to be a successful, professional artist. That comes through a great deal of hard work and even more luck. As a visual artist you should work on your foundational skills: anatomy, composition, color theory, etc. But then you look and see that some artists such as XKCD and the Oatmeal can succeed based on fun and clever ideas with very simple artistic skills.
And of course one of the more famous examples on the other end of the spectrum is Vincent Van Gogh. He was largely considered an unsuccessful artist while he was alive but became much more famous and his art has been among the most expensive paintings sold after his death.
The author, Neil Gaiman, gave a great commencement speech about making good art and how to do well as a creative professional. It's about 20 minutes long but I do think that it's worth the time: https://youtu.be/plWexCID-kA
So my answer is that it can be difficult to be successful as a professional artist, but that doesn't mean it's not worth the effort. Just don't into this profession without knowing that success could be overnight or could come late. There's no guarantee but if you're making art that you enjoy then at least you have done something that you can be proud of.
I don't mean to be a downer but I want you to understand that being a professional artist comes with some uncertainty. Good luck and don't give up. I hope to see some great creative works from you.
After all I want to say that every persons has hidden genius, so you should come out it and grow up. And be patience.
Thank you for your question
I'm not quite sure whether you mean musical artist or visual artist, but either way, the answer is basically the same. Anybody could be an artist. If you believe you are, then you are. It's a matter of how you define what you consider to be "success". You may think making a living as an artist and making enough to pay rent is success. You may think of making millions as your level of success. The arts field is a very difficult one, because it is very competitive and is hard to get your foot in the door. However, your main focus is simply to create, and then put your work out in to the world (whether it's through performing, selling artwork, social media, etc).
I hope this was helpful. Best of luck!