Sing “nobody cares about me” forty times a week and don’t be shocked when you start believing the chorus.

What you say to yourself often becomes what you believe, not because thinking makes things true, but because repetition makes them familiar. A sentence repeated enough stops being a passing mood and starts being background fact. None of that means the loneliness underneath it was your doing.

Notice the line you say most about yourself, and say it out loud once to hear how it sounds outside your head. Then try a smaller, truer version instead of a cheerful one. Something honest and less final holds up better than either the harsh chorus or a slogan you do not believe.