"Until the Day I Die" by Story of the Year
Oh man, I was such a punk-rock emo kid in my teenage years. (Still am, shh) The first song that comes to mind at the words "love song of your youth" is "Until the Day I Die" by Story of the Year (it's barely a love song though, let's be real). I used to blast that song in my room and think seriously about my crush of the moment with what felt like totally necessary urgency. The quote "Until the day I die, I spill my heart for you" was always in my AIM profile and at the bottom of every away message in alternating capitals/lowercase letters (because that's just what you did in the '00s). Those eight repeating notes at the beginning of that song still give me chills and make me think about all of the crushes and boyfriends of my past.