This is an interesting selection of majors you have chosen. You usually don’t see many people trying to decide between chemical engineering and computer science, which makes me question why you chose these majors. Just some food for thought:
Chemical engineering-- great option if you work in energy and live in the right place (do you live in Texas?–> $$$)
Computer Science-- this is the hot degree right now and there is a demand (great flexibility here)
Physics-- you will probably have to go to grad school-- is this a dilemma? if no, great.
Where do you see yourself in 10 years? I know this is a very difficult question to ask oneself, but it could reveal a tentative path to follow.
Have you looked at the curriculum for chemical engineering/computer science/physics? Does it sound interesting?
Where do you want to go to school?
Keep in mind that your degree doesn’t have as much bearing on your career as you would think. The chemical engineering major I knew went on to work as a consultant for Boston Consulting Group even though he got offers from Chevron/Exxon.