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You're not supposed to "do anything" and be a useful person in your community because you feel like it. You're supposed to do this because other people need you and because you need to survive. If not now then eventually. To participate in society because you feel motivated is not a good reason. Do the things you need to do and should do because your long term survival depends on it and because almost always there are other people out there who need you in ways you can't know until and unless they reveal it, and in many cases you will never know.