Hello Stargirl,
I think the song has potential. If this was recorded with a band and beefed up a bit it may have more commercial appeal but as a bare-bones recording, it's good. As for the singing, there are parts of the song where the vocals don't match the chords tonally, probably because as you say you are a songwriter first.
You ask if you could continue singing. Well, singing is just like learning an instrument, keep at it and it will get better and better so yes, the answer to your question is in your own hands.