Mia and Adam are the main characters in If I Stay. They met each other throughout the music program at their school. Adam loved to hear Mia play her cello, but Mia did not like to hear her senior boyfriend play the electric guitar.
The conflict in this book is whether or not Mia wants to stay or keep on fighting... All that the main characters want is that they would've all stayed alive, so that they could be happy. So, that Mia and Adam could grow old together, so Teddy can find his true love, so that Mia's parents could stay happily together.
Mia being in a coma, and her immediate family being presumed dead, is preventing Adam and Mia getting what they want. They cannot go to Teddy's wedding or throw her parents a retirement party, because they tragically died.