你真没用

1.You trash!
2.You're just a good-for-nothing bum!

[注]trash,good-for-nothing(废物);be good for nothing(毫无用处的)。

我真的很没用：I'm such a good-for-nothing.

You're good-for-nothing.
I am good-for-nothing.

You are hopeless!
I'm really hopeless!

You're good-for-nothing.

You bum!
You trash!
You are good-for-nothing!

You are a loser

I am really a loser