How about not being snippy?
One thing that does not define success is condescension or an inflated perception of oneself, particularly when one fails to miss someone else's point. I shared good advice with you, if you had bothered to listen. We can happily discuss what makes us successful, but we can't discuss how to be unique. Uniqueness falls upon us by luck or happenstance or good fortune (or bad fortune, as it were), and not by design or group discussion. There's no blueprint to being unique, because being unique means that there's no blueprint.
So worry less about being unique and maybe you'll realize that there are probably a million unique, or at least rare, things about you and your background that have helped define who you are. I don't know what they are. I don't even know who you are. And maybe you don't quite know yet, either. One thing that this med school application process has taught me is a little bit about myself, even if it is masked in an attempt to sound like a fantastic person. It's introspection and it's important.
As far as being successful...I think that topic is beaten to death on these forums, in the media, in self-help books, and on infomercials. I'm not really even sure what success is, but it probably varies from person to person.
However, if you want to know what it means to be successful getting into medical school (usually the definition of success if you are a pre-med, because the defined goal of that category is to get into medical school), then the formula is pretty standard. Take a high GPA and high MCAT, add it to demonstrations of great leadership, initiative, and involvement, mix it with work that shows your compassion for society and understanding of medicine. Be confident and aware of your accomplishments, but add a good measure of humility. Do something that isn't required for medical school and seems to display your lack of interest in what medical schools "want" (of course, you do seem to be quite interested in exactly what they want, but to our own extents, we all are). Blend with a unique backstory, hopefully something filled with overcoming hardship or demonstrating courage and defiance in the face of a machine of injustice, and shake well. That's your pre-med success smoothie. If, along the way, you find a cookie to eat along with it that makes you legitimately passionate about something, actually love medicine, and puts you on the track towards happiness, not just professionally, but personally, then perhaps you'll reach the end of the road and feel fulfilled.
And that, I guess, is all any of us can hope for.