you gave about your computer and the version of OS X that you are using.

My guess is that you have a laptop which has a trackpad and the trackpad is configured to send a double click whenever you tap it.
The trackpad sensitivity is set so that the lightest touch causes it to trigger a double click, which launches an app or opens a page or activates a link.

Take a look at System Preferences > TrackPad and either turn off the tap feature or lower the sensitivity.

Of course, I could be completely wrong and you just have an itchy finger on the mouse.

P