will keep me going for a long time along with the money

This depends entirely on you. I chose my path in life thinking “what can I do today and still be passionate to do tomorrow?” And here I am, some 15 years later, still liking my everyday tasks.

Some comments: not many writers have an income stream out of their work. Many have a little extra at the end of the month, most have their name on a book and that’s it. The Steven King/Rowling/… are few and far between.

A degree in Physics opens many doors if you do it seriously: physics research and coding being the two main one, but not only.

All comments we can give are local to us, your location and the society around you really influences the options. Talk to your seniors and professors and anyone willing to answer your questions about the job market. Think outside of the box but look at the data around you before jumping ship.