I do not mean to be intrusive here... but, DO NOT MAJOR IN THE SCIENCES! Here is why:
You'll be doing science for the rest of your life. Do something else. here's what happened to me... I came to school as physiology major. Indeed, i still am a physiology major as a senior, but since I've tacked on another major - economics. In retrospect, I *WISH* I had done something else instead of physiology.. something like english, philosphy, or history, or theatre... ANYTHING but physiology. Don't get me wrong, I *LOVED* all my physiology classes, but... i'm gonna learn all that stuff (even to a greater extent) in medical school.
Unfortunately, however, when I came in at the young, virgin age of 18 as a freshman, my interests were ONLY in the sciences - hence, my decision to major in physiology. Since then, my interests have expanded dramatically - history, politics, economics, philosophy, etc.
Now that i'm 21 and going through a bit of a mid-mid-life crisis... I realized that although I want to do medicine more than anything, I also want to study different things when i have time. So, i've decided to graduate in 5 years rather than the 3.5 years that it originally would have taken.
Phychology sounds like an interesting major. However, and I don't mean to overgeneralize... but, from my experience (friends, etc) the major is kinda easy/generic in the undergraduate setting. I think you might be more challenged (and believe me, you'll need the mental exercise throughout undergrad to do well on the MCAT and even med school) in something deeper... like a specific type of history, perhaps.
Of course, I have also thought that maybe my desire to go to medical school is a result of how much I love my physiology and sciences classes. But you know what.... being a physician is so much more than just physiology/biocem, and science. And now that I realize that now... i not only am studying other topics for "personal pleasure" but also for the long-term goal of being a more well rounded (intellectually) and compasionate physician.
Double majors are always an option... of course. And since one MUST take the premed requirements to even apply to medical school, tacking on a science major isn't all that difficult.
the important thing is, no matter what you pick.. even if you hate it, make sure you do well, GPA wise 'cuz that you need for a medical school entrance.
good luck though
leon