I need help

Guys, I sincerely hope someone sees this. I don't know anything about a musical career and I want to pursue it as a career, at a famous level, but I'm very afraid of failing. I'm 16 years old and I've ALWAYS liked singing. The point is that it took me a long time to realize it because I always liked artistic things and felt good in all of them (I draw, for example). But, only now I noticed that I have always loved music; It never left my day, EVERY day I listen to at least 12 different tracks. And, well, I know it sounds very ambitious, but it's really what I want. I wanted a career that was close to kpop/global groups, like CORTIS, KATSEYE etc. The thing is: I don't have any experience in music, I only participate in a choir at my school. I think I sing really well. Not Mariah Carey level, obviously, but I think I can manage. I wanted to create a portfolio, like a good musical passage, you know? But how? Where would I start???? I really want help.