The use of "since" is fine.
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NewguestSince I was five I've been obsessed about ...I would say: "obsessed with".
muslimflowerhelloPresent perfect is correct. The obsession started at five-years-old and is still
since I was five I was obsessed about ...
I think that is the right senten. why did you used the present perfect?
HuevosAccording to my dictionary obsessed with/about/over are correct.NewguestSince I was five I've been obsessed about ...I would say: "obsessed with".