Gustav Lange - Thine Own , Need Advice!

[hanon_virtuoso]

Hello, thanks for opening this post 

I just started to learn one of Gustav Lange most famous song, "THINE OWN".
Now i can play it from the beginning to the end.
But the problem is i dont understand this song. I still not get the picture. I dont know what to express on this music, is it sad, love, or etc.

I still confused too about how to sing the melody part, what is the main point of playing singing part/melody of the song?

Please help me. thanks