What is ridiculous about the idea that your life has been ruined?

The assumption that otherwise it would be perfect.

That were it not for this one unfortunate choice, decision, move, behavior, or event you’d be now enjoying life. Only enjoying it!

How do you know such things? How can you be sure that everything would just click and you’d be happy as fuck?

Are there no other unfortunate events that, if they happened, could disturb your peace of mind or destroy your comfort zone? Is there no alternative shit?