I can't start my session (other sessions work) what should i do?

Ok, here's my problem, Yesterday, i installed gamepad companion on my mac, after a few tries i couldn't make it work, so i tried uninstalling it and rebooting my iMac to repeat the procedure, but when i tried to start my session it opened like for 5 seconds and only the dock appeared, no desktop files, after that 5 seconds my session closed, i tried again and the same happended, i tried rebooting it and the same happened, then i tried to start my mom's session and it worked, so i tried again starting mine and guess what? yes, again 5 seconds, i tried reapairing my disk, the safe mode, the single user mode and nothing... HELP!