Is it possible to uninstall SSRS? I installed SQL Server with Reporting Services package by mistake and I will never have a requirement to use the Reporting Services part. 

Is it possible to uninstall Reporting Services (and anything else that would have been included/installed because of Reporting Services)?
Go to Programs and Features, find the Microsoft SQL Server 2012 (64-bit) entry, select Uninstall/Change, and then select Remove in the window that pops up.

You select the instance you are working with:


Then check Reporting Services you installed: