Direction, I think a lot of people can ask themselves the same things: what's wrong with me? For me, it came about after my husbands long affair. We tend to internalize the justification.
"Focus upon what you want, not what you don't want" ~ something my therapist repeats to me all the time. If you know you are a great catch, walk with that thought in your pocket. Push away the negative self-talk as it arises, challenge it until you believe the new self-talk. It may feel foreign at first but with more experience, it will become a part of who you are. Even the most charming of people experience negative self-talk.
Feeling lonely is a hard place to be. Try some self-care until the feelings begin to ease. I know it's easier said than done, but please do try. That's what ice cream is for

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Songbird
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"It is good to have an end to journey toward, but it is the journey that matters in the end.