Becoming an entrepreneur is easy. Start driving for Uber or Lyft. They will call you an independent contractor which is another way of saying entrepreneur. You have probably already been an entrepreneur at some point in your life. If you have ever had a yard sale, mowed a lawn for money, or bought and sold tickets to a concert or sporting event – congratulations you were an entrepreneur.
I think what you really want to know is how to become a successful full time entrepreneur.
There have been countless books and articles published on this topic. Most state that you should look for a problem to solve or identify a pain point. The idea is that if people have a problem or if they have something that is causing them pain, they will pay for a solution. So, if you develop the solution, you get paid.
This approach is not all bad, but it fails to address the success of numerous entrepreneurial endeavors. For example, the find a problem / pain point approach completely fails to address the success of the “Pet Rock”. The Pet Rock was a real rock marketed as an alternative to an actual pet. It was sold in a box with holes in it so your pet rock could breathe and it came with a manual explaining how to care for your pet rock. This was the idea of a man named Gary Dahl and he sold about 1.5 million of them for $4 each over a span of about 6 months from September 1975 to February 1976 (per Wikipedia). This generated $6 million in revenue and nearly as much in profit. Pet Rocks did not solve any great problem and they certainly did not alleviate any points of pain.
The two primary keys to becoming a successful entrepreneur are; 1) question all of your assumptions and 2) develop your market.
You stated that you like physics, math, chemistry, and computer science. It would be great if you could figure out a way to use these interests to do something entrepreneurial. However, I will caution you that you will need to constantly challenge your assumptions as your love for these subjects may blind you to what the market wants. In entrepreneurship, the only thing that matters is what the market wants because market demand will dictate the level of success or failure of your entrepreneurial offering. It does not matter how great you think your product or service is, or how revolutionary and visionary you think it is, what matters is how well your product or service is embraced by the market.
I hope this helps.
I wish you much success on your entrepreneurial journey.