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Question: I was going to write a PS about the socioeconomic obstacles I've faced and how I've overcome those problems but I think it might come off as too whiny. Would a stronger PS maybe talk about those obstacles but how I've used that background to motivate me to get involved in helping the less fortunate by volunteering my time to certain organizations and events?

Yes. The more layers of meaning you can add to your experience, the better. No reason you can't also talk about overcoming the obstacles as well though.