Am I a good singer? I was told that I wasn't?

I feel that you focused too much on background effects. Like the voices during the beginning, they should definitely be turned down a bit. Also sing the song to it's natural pace, don't try to speed by, you can reduce the tempo of the song if you feel more comfortable that way. Overall it sounded good, just make sure that we can hear your voice and remember to make it feel as natural as possible.