I think, generally, the advice you are getting thus far is sound. However, I don't think that saying "write about what you have overcome in order to differentiate yourself" is necessarily good advice if you simply confine your personal statement to a lengthy discussion of such difficulties. As others have noted, there are common traps that people are tempted to fall into. These include why you have ALWAYS wanted to be a lawyer, talking about difficulties in your life without a purpose other than to say you have had a hard life, using life examples that really say nothing about you etc. I would worry about losing focus in your essay.