I don’t want to embarrass myself.
Everyone I sing in front of say i have a very good voice and that i sing like reba mcentire, which is odd but she is a good singer. so how do i know if i sing good, the people im sung infront of i trust allllooooot lol
iv tried out for a play and…..I got more claps then everyone my age….im 13 lol
ok so ya…..=D
It is not that simple 
I think that there are two major categories you can measure yourself by:
1. Accuracy. How accurate you sing or how true you sing in musician sense.
2. Appearance and charm. Of course, you might be charismatic and the crow can love you even if you cant sing at all.
So it is up on you how you feel about it.