I find that songs are the most difficult thing to translate (except from poems, which I haven’t tried out yet). In this one I’m having problems with almost every line because I find 2 different ways to interpret the meaning of almost every line. I dunno if it's because i'm not native or if even natives would have (some of) the same thoughts as me when reading the song. I hope you can enlighten me. Also please bear with my english expressions, as I'm not native. I guess some of them may be incorrect but I think you will understand what I mean :cool:

なんでもない　なんでもない　君の笑顔を
- Everything is alright. Your face I'm the one who has discovered it... (see next line)
- Your face is plain normal.
あいつじゃない こいつじゃない　僕が見つける
Not that guy neither this one, I’m the one who has discovered/found you
世界中で　僕だけが知ってる　ほら素敵な君さ
I’m the only one in the whole world who knows your wonderful you (your smiling face?).
目立たなくて　
- You’re shamefaced
- You’re extremely shy
- You don’t stand out / Your looks are plain
泣き虫で
You are a cry-baby.
さみしげに顔伏せてる　
Your head looks down and you have a sad look.
君がいいね　
- You’re hot
- You’re nice / wonderful
抱きしめたいよ
- I wanna hug you
- I wanna make love to you (like “dakitai”)
ハート重ね合わせよう
Let’s join our hearts
(more literally the feeling would be “let’s make our souls match so that we can be a matching couple” or something like that, right? I just don’t know how to put it into words. I think “let’s join our hearts isn’t the best translation)
なんでもない　なんでもない 恋の魔法で