do own thing

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do one's (own) thing

To do what one is interested in or skilled at, rather than simply doing what everyone else does. You don't have to go to med school just because your sister did—you need to do your own thing. Andrea is very independent and usually just does her own thing.
See also: thing

do (one's) own thing

To do what one does best or finds most enjoyable: "I get paid to try cases and to do my thing on trial" (Bruce Cutler).
See also: own, thing