Some of these you can eliminate physically and they no longer bother you. Switch the radio off. Tell your friend you'll gladly chat later. If you can't stop the interference, it can help to decide to allow its presence . Often if you accept the presence of a noise, you'll find it no longer is a nuisance.
Internal interference is the crucial one to eliminate.
It's self doubt or even self congratulation. It's any thought which distracts you from the experience of making music. Some of those internal questions you can sort out before practice time, so that when you're playing you can concentrate. If you play in a band and you're practising for a performance, get the details of where, when, payment, etc., out of the way. Then you can concentrate on the music.