What is this worm-like creature?
The other answer is most certainly incorrect. Silverfish are silver/grey and (like all members of the Zygentoma order) have three distinct, tail-like caudal appendages from their posterior end -- really, two large cerci with a central long filament.
 [Sources: 1, 2, 3].

The OP's specimen resembles the larva of a dermestid carpet beetle of some type; specifically, the location and appearance make me think it might be a black carpet beetle (Attagenus spp) -- for example A. unicolor.



 Source: Univ of California Master Gardener Program of Contra Costa County Blog 

Description:

Tell-tale characteristic: the tuft of numerous "hairs" on the posterior end:


  The larvae of the black carpet beetle, which may reach 12.7 mm in length, are very different from other carpet beetles’ larvae. They are elongate, carrot-shaped, golden to chocolate brown, and have a tuft of very long, curled, golden-brown hair at the tail end of their body.  [Source: Penn state Dept. of Entomology]



A description from IFAS suggests that larvae develop stiff, bristlelike tails when older. 


See bugguide.net for more pictures, such as this one

Pest: 

According to many of the sources I've linked to already, the larva is the damaging life stage of this beetle.