Is it normal that i sound good then bad?

Sounds likk your FUCKED UP IN THE HEAD to me.

Same.

Happens to everyone. I remember once I was home alone and I was singing out loud, and I sounded soooo good. My brother came upstairs, I didn't know he was home, and told me 'not to quit my day job' hahaha.
Sing anyway, who cares. :)

Tone Deaf.