"women's fiction" with semi-romantic subplot

-Minnie Cooper and Quinn Hamilton were born on the same day, and his family won the prize money, and he “stole” her name. Every birthday, Minnie has terrible luck, while Quinn appears to have lead a lucky, charmed life. They meet on their 30th birthday, and over the year form a friendship that leads to more feelings…

[obviously Quinn’s life isn’t perfect: his parents are divorced and his mom has anxiety and agoraphobia/issues. Minnie is an idiot to Quinn and to her boyfriend Josh, and is a jerk to her bff about their business. It’s not until 45% that both M+Q are single; the swimming thing was a connection that we hardly get to see. This was NOT a romance, but rather a ‘finding myself’ women’s fiction with a half-baked romantic subplot.]

-NOT A ROMANCE. Minnie was a total idiot, she just blamed the jinx for her problems, and put no effort or thought into many of the situations she was in. She was a terrible communicator with everyone in her life, and I didn’t feel that her character improved by the end of the book.
Pace dragged and was bogged down by weird subplots of her bff’s proposal and by the pointless flashbacks.
Minnie’s mom sucked and was harmful, until suddenly she’s best friends with Quinn’s mom and helps her, and then randomly apologizes to Minnie and is loving?? The mom conflict was not resolved and was infuriating.
Very British book, actually to annoying levels. Also were random judgmental comments along the way having to do with India’s culture, people who cared about the environment, multiple weight-related evaluations, etc.