Paul is very concerned to teach people how to address challenges and answer questions with a Jesus-centered mindset. In the end, the question of marriage vs. singleness is not one of personal happiness but the opportunity to serve God and one another.

If you're curious about the archer's paradox:
https://www.youtube.com/watch?v=O7zewtuUM_0
(skip to 57 seconds if you want to jump to the explanation)