Depends, cant see the real damage that would make it totalled, such as how much your car's frame is fucked up and how much of your exhaust was damaged. Since you were rear-ended your engine and the majority of your shit should be fine.
From that amount of impact your frame will definitely be bent in other places besides the back, but technically speaking it may be fixable. Certainly wont have the same handling or ride after it is since they can never really realign the frame to perfection again and you wont be able to align your wheels perfectly either.
I guess mostly just depends on frame damage, exhaust damage, and your rear axle.
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