It seems as if you are singing while working on something else like fishing. To really "sing" sing, try emulating that which you like---which would really involve finding what key in which you "sing" best, and then sing loud. It takes dedicated practice to become a singer in the sense that I consider myself to be(a hard rock, alternative rock vocalist) an that many others in popular music are. The file you showed us doesn't contain anything worthy of what your true abilities are. Verdict--I can't tell from this audio file if you are a singer or not, but it doesn't show anything to say you have any real interest in singing.