Fear can make for an inability to stay present with the music you are playing. Fear of what? Common suspects are fear of inadequacy, lack of knowledge, lack of experience, fear of inauthenticity. So are those concerns accurate? Yes. No. Partly. Maybe. Who cares.
Connection with others and with the music you are playing matters more than your strengths/weaknesses in musicianship. Of course your technique partly defines the music but it may be that the intention of the music and your commitment to presence matter more than flawless execution. Regardless, it’s too much to assume that the impact of your music is defined strictly by musicianship or your paranoia thereof.