Sobrar is a fascinating verb that means "to be left over" or "to be in excess". It's the opposite of faltar (to be lacking), which also appears in the song when he sings, "Pero me faltas tú" (But I'm missing you).
In the powerful line, "Me sobra juventud" (I have an excess of youth), Luis Miguel expresses that even something as precious as youth feels worthless and superfluous without the one he loves. It's a poetic way to say "What good is my youth if I don't have you?", perfectly capturing the song's theme of having everything but the one thing that truly matters.
Mexican pop star Luis Miguel tackles a brutally relatable moment in "Tengo Todo Excepto A Ti": realizing you are completely stuck in the friend zone. The track opens with blunt honesty: "Se ve que no te voy / Se ve que no me vas" [It shows that I'm not for you / It shows that you're not for me], followed immediately by the sting of "sólo me quieres / Como a un amigo más" [you only love me / Like just another friend]. He lists off everything going right in his life, like his youth, wild flings, and good times ("Tantos amigos, caprichos, amores locos" [So many friends, whims, crazy loves]), only to reveal that none of it matters without the one person he actually wants.
What makes the song stick is how dramatically it frames unrequited longing. The singer compares his crush's beauty to the April sun ("Bella como el sol de abril") and admits he feels completely blind without her gaze: "Y sin tus ojos / Mis ojos ya no ven nada" [And without your eyes / My eyes don't see anything anymore]. It is a massive, dramatic ballad about having the whole world at your fingertips yet feeling like you have nothing at all.