這個句子用英語怎么說？

i suppose i would have become a superstar when i come back from America.

對于全世界來說，
你只是一個人
；然而，對于我來說，你卻是我的全世界
With
regard
to
the
world
you're
only
a
person,
but
for
me,
you're
my
whole
world.
Though
you
may
be
just
a
human
in
this
world,
you're
totally
my
entire
world.

翻譯過來是To
the
world
you
may
be
one
person,
but
to
me
you
may
be
the
world

I guess when I came back to America that would have become a superstar.
這句話中的從句缺少了主語I，請在would前面加上I就完整了：
I guess when I came back to America that I would have become a superstar.

希望可以幫到你