how do i unbind control+left-click from right-click?

I have this problem where when i press control+left click at the same time it right clicks. I use a lenovo mouse. This is a problem for me because i play a lot of shooter and fps games and i can't crouch and shoot at the same time. For example when i try to crouch (ctrl) and shoot (left-click) it just makes me aim down sights (right-click). I've tried switching command and control keys and it has the same effect. Any help to disable this feature is appreciated.