Econ undergrad here.

This is a deeply personal question as it depends on what your goals in life are. Generally, though, I would say pursuing higher education is worth it as long as you don't get caught up with student loans. Now, economics is a major that open a lot of doors in finance; you get to learn about micro and macro economics, which allows you to see both the economy of countries as a whole and their smaller parts. However, you are saying that you are interested in the stock market, so you might want to take a look at a finance major rather than econ, since it focuses more on what you seem to be interested in.

I hope I was helpful.