I graduated in 2008 with a degree in psychology and now i'm a 2nd year doctoral student in the organizational psychology program at Columbia University. The courses that I took include social, cognitive, personality, experimental, educational, counseling, clinical, language development, business/organizational, quantitative analysis, and several others that I cannot recall at the moment. As you can see, the psych field can be very diverse, which is why other answerers have recommended that you pursue graduate study in psychology if you hope to get anywhere with it. This is very true, a BA in psychology is not very direction-oriented. While it does teach you vital skills and trains you to see the world in a completely different manner, good luck finding someone who will pay you for having those skills.
I was friends with many other psychology majors during college and, not surprisingly, we all enjoyed studying different aspects of psychology. Since it is such a divese field, there is plenty to choose from. As such, it is often important to either double major or minor in something else if you hope to get a job right after college. As I said, Psychology is interesting, but not necessarily useful at the Bachelor's level. I dual-majored in economics and psychology because I knew I wanted to work on the business side of psychology one day. A friend of mine minored in educational policy administration (or something like that) and he is now working toward becoming a school psychologist. I would definitely recommend that you pay attention to your intro psych class and decide which unit you enjoyed the most and take a class dedicated to that unit as soon as you can. If you decide you like it enough to possibly pursue additional study in it, then pick up a related minor or double-major if you can.
Research design is a huge part of psychology because a lot of the field has to do with forming a hypothesis and then testing it. In fact, your thesis and eventually dissertation in psychology will start with a theory, then become a hypothesis, and end with you proving or disproving it with data you have collected. I'm not going to go into too much detail with this because you'll get lots of practice with it in college (hopefully starting with your first psychology class), but it is basically how psychologists prove or disprove and sometimes form theories.
The process for me was quite difficult, but then again I made it hard on myself on purpose. I took anywhere from 18-21 credits every semester from my freshmen year to the time I graduated. Looking back on it I'm glad I did what I did, but I truthfully could have taken it a bit easier and still gotten to where I am today. But I still feel that it is important to at least minor in something else if you're majoring in psychology so you may be taking more courses than people who just have 1 major. All in all, it's not a terribly hard degree to earn unless you make it difficult for yourself like I did.
Psych is an extremely intersting field to study, but plan on going to grad school. good luck!