Agreeing with hverts advice of marrying a major (I like that phrase lol). Do what you enjoy, shadow a professional in your field.

Try to get a feel for exactly what classes you will need to take and when. If you don't sign up for certain key classes for your major when you're supposed to, it may mean spending an extra semester in college even! The best way to avoid this is to constantly talk to counselors and people in your department and sign up for classes as early as they let you. Take classes in the summer breaks!

Since finances are an issue you may want to consider taking some classes at a community college, especially in the summer and winter breaks. They are often less intensive and you cut a lot of cost like that. I know you want to go to a 4 year school but have you considered starting out at a CC and transferring? There's no shame in that. Most people do that and it's a very smart way to go about things. It takes a lot of stress out. I have a sister who did that and it allowed her to not get slammed by the situation so she could think clearly every step of the way. By going straight to university away, I felt like I was in a whirlwind. Things happened faster than I had time to process and I was stuck on doing things in a "conventional" way. I started out in 2 majors that didn't work out, almost flunked out of school and I was broke pretty much the whole time.