Rich mentions the singing out of tune bit, but it goes so low that your range cannot actually hit those notes. Musically, the melody is quite random and doesn't follow the chords in any usual way - the chord progression and your voice don't seem to be linked? I'm assuming you played the organ? Not being unkind here - but one session with a real singing teacher would sort out some of your issues - which of course, you might not be aware of, depending on your aural acuity. A posh term for hearing a note with a pitch and being able to identify it, and sing it back. Sometimes, the teacher sorts it straight away with some practical advice and sometimes they can't. I suspect you don't know which version you are, so before you waste time and energy, find out from a local expert. They might be able to teach you to sing, they might not?
My alarm bell rang a bit when you said you 'made' the track, not recorded or played and sung on it? Did the organ chords come from some kind of software? That might be why you struggled?