I really like this a lot because i sadly can relate to this all too well. The emotions are well penned and another thing i like is it doesn't feel like an acrostic even though you made it into one, it flows that well to me. The meaning seems to be that the character (maybe the author?). Fell in love too soon and it ended up in heartbreak and now you miss that person dearly.
The reason i think it was a young person, is because you used naive, which i believe works well here because it adds to the meaning of the poem, and lets the reader create their own meaning to a point. Well done