'Easy' to say, but I wonder if I will be able to sing in a way it'll not let other run away the moment they hear me sing. I have no ability to keep a note at all. Sounds to bad when I try, I hardly can imagine I'll ever be able to keep a tone or note.

Sure, practise, but I shall first take classes from someone who can help me to keep a tone or note. When I can';t do that, no point to even try further :)

How is your voice doing? Something you can share with us?