First off: This is an incredibly ballsy book. In the age when alt-lit is defined by self-indulgence and confessional tropes, it's refreshing to see a book that revels in those qualities rather than hiding behind them via a wall of self-martyrdom. Or, it's ballsy that a writer unforgivingly embraces the culture of want without any self-flagellation.
That said, I found Because difficult because it can't seem to strike a balance between that assertiveness and preciousness. At times it can be heartbreaking, but other times it comes off as very naive, especially when the author yearns to have faced more difficulty and/or adversity. To me, that seems like a very privileged POV. And when you begin every sentence in a book with "I want", that privilege doesn't wear too well.