Still confused

So I have once again decided that I don't really know what my major is going to be. I've been thinking (and stressing out) a lot about this lately and am swinging back in the direction of Environmental Studies with a minor in economics. As I have said before, this decision may not last.

I registered today for summer term classes. I decided to not take a math class over the summer. This is more due to the fact that the math requirements are different for an ES major and an economics major.

I am registered for four classes. I wanted to take HE250 (required health class) online, but apparently waited too long to register, even though today was the first day. I still signed up, but am #5 on the waitlist for this class. I may or may not get in to it. The decision to not take math freed up the time for ESR172, which is the same as the ESR class I took last term, but from a chemical perspective instead of a biological one. And I already own the book. I think that this class will have more field trips than the last one and it should be a fun class. It will be on Wednesdays from 9am to 12:50pm and field trips will be on Thursdays at the same time. I registered for on online version of the economics class that I wanted to take this term. Hopefully this one won't be canceled since it is online instead of on campus. I already have the book for this one also. And just in case one of these classes is canceled or I can't get into the health class, I signed up for  CH105, which is the second chemistry class in the series for non-chemistry majors. I took the first one, CH104, last summer. This class is a long one. It's 5 credits and will be held on Mondays and Wednesdays from 6pm to 8:45pm (lecture) and Tuesdays from 5:30pm to 9:20pm (lab). The book for this class is outrageously expensive at $189 plus $38 for online access to OWL.

I still have nearly $2000 left from my IDA account and that will more than pay for classes this term. Even so, I have been seriously entertaining thoughts of getting a part-time job soon. I could just spend all of my savings and start getting student loans, but I want to push those options off as far as I can. I'm thinking about getting certified and working as a security guard, mostly because it's easy, there are a lot of part time opportunities, and I can probably work weekends which will leave the whole week free for school.