I'd been singing around campfires for years before anyone bothered to tape anything with me in it and I'd always thought of myself as having no accent at all. One summer vac I worked as the despatch/storeman for the distributors of National (Panasonic, these days) electronics gear in Melbourne so I thought I'd take advantage of some of the equipment lying around the sales reps offices as demo models. I didn't sing; just spoke a few sentences.

So it wasn't the quality of the gear that caused me to be shocked by the broadness and 'outback' Australianness of my accent that I heard from the tape. Later, when I was married to an audiologist, I found out about the fact that your ears pick up external sounds not just via the canal but also through the bony structures around the ears. Blockages of either of these can affect the quality of what you call 'hearing'. Internally generated sounds like speech and singing are also affected by sinuses and other bony structures in the skull and create other effects on how you hear those sounds.

On top of this, your spoken voice is usually different from your singing voice, even at the beginning. As you become more proficient at singing, the differences between your two voices can become even more marked, unless you train one or both. The training can be quite unconscious. If you listen to lots of singing done in what some might call 'regional dialects' that are different from your own, you may find that, when you sing the same songs, you voice is reproducing some of the characteristics of that (or those) dialects even though you're not conscious of it; listeners with a good ear can pick it up though.

And, if you do a lot of recording, your own voice becomes one of these dialects when you hear it back; this can also change some of your 'expression', again, without you necessarily trying to do so.

Go for it!

Cheers, Rowan