Thank you for your answer
Actually, I never imagined that someone could tell me this kind of comment ^^ (That I a had a "good" voice). And I agree on the fact that I need to be more involved by the song, and try to abandon the choir mindset. (At least, when I don't sing in it.)
I feel that I need a singing training, though, because I think I would gain in confidence, be able to project my voice more than I do now, and see what I can do, and what I can't. (And train to improve )