Do you have any advice for me 🙋‍♂️?

The best way to learn is to experience. One of the fastest ways to learn is to use the experiences of others. I'm Kagan. I am 18 years old, a young person interested in marketing and entrepreneurship. I will establish my own startup in the future, but before I start, what advice would you like to give to this young entrepreneur candidate (me)? - I have little experience (small business and few marketing work experience), - I have almost no professional and friend circle on this subject, - I have no experience in any subject, - I am very indecisive, I can jump from topic to topic (before that I played guitar for a while, then I quit and did gymnastics, I quit and played violin again, so I start something else without specializing in one subject)