Danny Cheng is a young adult, but an almost grown up at the same time, who has a lot on his plate and difficulties with his parents as most people his age do. Nothing too big as on the level of a soap opera, but on a more basic human level. I appreciate his way of observing people and think this part explains it well:
From watching my parents I think being married or being with someone else in any kind of real way takes a certain amount of bravery, and it's not something I'm positive I have in me. To pluck your heart from your chest that way and hand it to someone, unprotected, and wait to see how gently they'll stitch it back in for you, or not - to wake up all those days you're the crappiest version of yourself and face the person who knows you best, morning after morning, year after year. p. 85
From watching my parents I think being married or being with someone else in any kind of real way takes a certain amount of bravery, and it's not something I'm positive I have in me. To pluck your heart from your chest that way and hand it to someone, unprotected, and wait to see how gently they'll stitch it back in for you, or not - to wake up all those days you're the crappiest version of yourself and face the person who knows you best, morning after morning, year after year. p. 85