I have to agree with Chili. The repetition does cause the song to get a bit stale. Even though you do change up the vocal melody (great voice by the way) sometimes, the song just seems to sit on the same emotional plateau throughout.
I think it also doesn't help that the repeated chord progression is very stock as well (i-bVII-bVI).
Specifically, the very first line of the song doesn't make sense to me.
"I never thought that I could feel this way before."
You're mixing tenses. It seems as though it should either be:
"I've never felt this way before" (or some variation) or "I never thought that I could feel this way"
I know that the line rhymes with "reborn," so I can see where the "before" fits in. It just doesn't make sense with the "never thought I could."
In general, though, the song just seems a bit too stock all around, IMHO, including the vocal melody. To me it sounds like something someone might improvise over this progression. And maybe that's the problem; it's kind of hard to come up with something original over such a tired progression, though people do do it occasionally, I suppose. It could be dressed up a bit if you changed the progression for some sections, or changed the rhythmic feel, and maybe that would help.
Don't get me wrong; it's nice and all, and your vocal performance is great. But it just sounds a bit emotionally stale to me.