market demand:software eng, maths,or physics?

I need to decide what to study when I apply for college.
I'm interested in all three, equally, as hard it is to believe.

What should I do? Should I take a year off to work and think about which of the three I really want to learn and work after graduating?
Or go for the one which will be highest in demand in 4 years (major)? Which will be?

Please help me, counsellor /pro.

You will take freshman courses in all of these subjects and immediately realize that your "interest" in these areas is really just a masked form of self-satisfaction in feeling smart. Then you'll pick a major based on lucrativity and in time switch over to business because "that's where the money is at."

The thing to take away from all this is that you probably do not need to, nor are able to, determine your major right now, and in addition it probably won't have much to do with the way your life turns out.