Just a few quick comments:
1. Go with what you love; don't go for tons of money--you won't be as happy.
2. Out of your three choices, chemistry, humanities and computer repair technician, chemistry is the least risky choice. You will float from job to job making above minimum wage with no career advancement unless you're lucky if you're in the computer repair business, and you'll be lucky to have a job at McDonald's as a humanities major.
3. Sadly, chemistry requires a lot of education for little returns; a BS in chemical engineering will start you off with almost as much money as a PhD in chemistry, and generally a BS or even and MS in chemisty won't get you s#*$. You pretty much have to have a PhD if you want to do anything cool. If you've got a BS, you can work at Sigma Aldrich and melt salt all day or be a janitor for Monsanto or Merck. If you have an MS, you get to run an HPLC all day, or take IRs of shampoos for quality control. The truth is that no one is hiring bench chemists with BSs anymore, which is a shame. If you want to do research, you pretty much need a PhD.
4. This should all be taken with a grain of salt, as I'm slightly jaded, and all of this is just my opinion.
5. Chemical engineers know and do very little chemisty on average. They do some difficult flow-control problems, but not much if anything in the way of real chemical research. If you become a chemist, you generally figure out how to do things in the first place. You can work at a college or university, nearly picking your location from a number of smaller schools, although the market for that is difficult at best right now. You can also work in industry, like for DuPont, or another major chemical manufacturer, or you can work for some really interesting analytical or consulting businesses. One that I know of is www.chemir.com
They do some really interesting work. You might also be able to work for the government, too, at one of the national labs, or perhaps at a military base, if that's what you want to do. Or perhaps for the EPA or something like that.
Hope this rambling helps you. I got into chemistry because it was fun for me and I enjoyed it, not because I was good at it. I was always much better at math or Physics, but I never enjoyed them as much, so I went where the fire was (literally and figuratively). Best of luck to you.