我可有可无的英文

Optional

我是一个可有可无的人I am an unnecessary person.

I wonder if I'm nothing in your heart.

If in your heart, I am not essential

nonsense，毫无意义的意思！

not essential; not indispensable; may or may not be needed; be as well without it as with it 。

As for you,whether my things does a matter or not?

很高兴为你解答。你可以翻译成：（意译）As for you, does my existence mean nothing to you? 希望能帮到你，祝你成功。