How very sad. People are likely going to find two out of these three things -- alone, and successful.
The happiness will elude them as they bounce from one travel buddy to the next until they are used up emotionally and sexually. And then you're forty or so with not much to show.
There was an obituary that recently went viral. The woman wrote about being born, blinking, and then facing a terminal illness. In that obit she said her most cherished memories were through her family relationships.
Yes, not all people should marry, but many are actively seeking to avoid marriage simply to have more for themselves, such as traveling Europe. In other times some would refer to this as hedonism.
Paying $20000 for a wedding dress is stupid. She could spend $500-1000 on the dress for her wedding and still go to Europe.