Someone is controlling my computer they locked me out of it.all I can go to is system utility

[Man-man123]

I don’t know what to do 

[TheOldMan]

Unless a hardware failure is causing this, one way to get away from "Someone is controlling my computer" Is to disconnect the hard drive.  If someone has gained control it most likely is thru malware.  With the hard drive disconnected, make a Live Linux disc and then boot to that.  I like Ubuntu or Linux Mint.  You need to do that on a different PC, then boot the problem PC to that new media to verify that the PC actually still works without someone's interference.  If it is possible to do everything like web browsing etc, then most likely need to remove the malware from the system hard drive to allow normal use again.

Report back with hows things work out.