Don't worry about being cliche. I spent over a month trying to write my AAMCAS essay because I was trying to be original. I started out writing a really sarcastic essay that got blasted by the first person I sent it to on SDN to review it. It's really difficult to stay away from the cliches, but if they're the truth, you should have no problem writing it since you'll have plenty to say about it.
The focus of my essay was looking for a challenging, integrative career. I didn't mention once about helping people since I never really considered medicine that way. My belief is that most all careers are in someway beneficial to humanity so I felt it was kind of moot in wasting space talking about helping people since that was not my primary focus. Work with your intentions rather than artificially creating some that you think the adcoms will like.
I'll be happy to review your essay if you'd like. I went over a handful last cycle while other people looked over mine. It helped me immensely.