Passion vs Market Demand

I have a strong interest in
Teaching people about computers...a school, maybe?
Owning a supermerket....Well, let's start with minimarket
Writing programs to make life more efficient?

And Market Demand:
In my country, people still don't appreciate the power of computers. Hence, there is less interest in learning computers. But I still think that a lot of people in my country is learning outdated way of programming. Still have a chance!

Carrefour is big in South East Asia. Walmart keeps opening stores every week. Where do I stand a chance to crave a corner in the market for my minimarket? What competitive advantage I can provide? Sigh...Kinda hopeless to see those giants invading Asia.

I like to write programs whenever I am free. Not that I am super duper passionate about programming, but I always think that I can make processes more efficient with programming. There are giants in software market. Not to mention open source software market. What is my selling concept?

I was watching a documentary on Walmart. Why it can grow so big? I must come out with something before the giants arrive in my backyard! But all the ideas I have will be shot down by my family, my friends, etc...Probably I didn't have a good attack plan. Keep thinking, Handiest!