A "good voice" is like a "good guitar" - it's no more than an instrument with a certain amount of musical potential. In the hands of a hack, it's more than annoying; in the hands of an artist it can be a joy supreme. But then again, for an artist any voice can be a "good voice". And genius can pull beauty out of the least promising of instruments.

Perhaps what is more critical to being a "good singer" is having a "good ear". Listening is a skill. Knowing which sounds are on pitch, which are pleasant, which are compelling can elicit a positive response even when the vocal range is limited and the tone quality is lacking.

Choosing what to sing is another critical element to being successful as a singer. Figuring out the songs that suit your voice is an often underrated part of the learning process.

Not everyone can sing well. Unfortunately there are people who are tone deaf. But 'most everyone can sing some. As to whether your voice is "good" or not, don't trust your critics or your fans; trust your own voice. Listen your voice with an honest ear. Chances are, if you like what you hear you've taken the most important step. Sing on.