Steccati literally means "fences" or "palisades". It's a vivid and somewhat uncommon word that you don't often find in pop songs.
In this song, Ramazzotti sings about being "confinanti di cuore solo che ognuno sta / Dietro gli steccati degli orgogli suoi" (neighbors of the heart, except that each one stands behind the fences of their own pride). It's a beautiful metaphor for emotional barriers, where two people are close yet separated by stubbornness, making it a memorable and poetic image.
Eros Ramazzotti is thinking about someone from his past, and it feels like no time has gone by at all. He sings, "Sto pensando a te / Come se questo tempo non fosse passato mai" (I'm thinking of you / As if this time had never passed). The song explores the ups and downs of a relationship, the "distacchi e i ritorni" (separations and returns) that can leave you confused.
The most powerful idea in the song is that he and this person are "Confinanti di cuore solo che ognuno sta / Dietro gli steccati degli orgogli suoi" (Heart-neighbors, only each one is behind the fences of their own pride). They are so close, yet kept apart by their own stubbornness. He accepts this is just one of those things, "cose della vita" (things of life), but he's still struggling. He's still standing, but he spends his nights thinking about her, wanting to face his feelings head-on, even if it means skidding on the 'curves of the heart'.