One thing almost every guitarist does at some point in their career is become attached to staring at their fretboard while they play. This is bad stage presence, but it is easy to fix. Sometimes, especially when playing something hard, it is necessary to look, but do not make it a habit. Here is a quick tip to fix your habit of staring at your fretboard.
TIP – Go into a dark room, the darker the better. You should not be able to see anything. This may work best at night in a dark room, or a room without windows. You could even consider putting a bandana over your eyes. Whatever you do, make vision impossible.
Once you have limited your vision start practicing guitar. Practice things you already know. Practice playing scales and chords without vision. You may find that you keep hitting wrong notes, but that is alright. Listen to what you play, if it sounds wrong, keep trying. Eventually you will become comfortable with the feeling and you will be able to perform these tasks without looking at the guitar. This may take some time, but keep being persistent.
Once you are able to play without looking at the guitar, it boils down to noticing when you start to stare. Keep an eye out on your behavior once you start playing. When you recognize yourself looking when you do not need to, stop it. After awhile it will become normal and subconscious.
Good luck, and sign up for the mailing list to get more lessons.