Normal for a 4 or 5 year old?

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DD is 4.5 years old and I still can not leave her alone even to do something as simple as shower.  She either gets in to stuff she's not supposed to or I'm afraid she will leave the apartment.  Is this the norm or can you leave your 4 or 5 year old alone long enough to shower?  I know she is too young to be left unattended longer than that but it seems kind of odd that at this age I still can't even shower while she's awake.

ETA:  Maybe it is me being overprotective.