This poem was good but I have some suggestions to help you at:

First, capitalize all of your "i"s, its just proper grammar.
Second, I felt like you overused "i" and "she", I know you were listing the difference but maybe change it up a bit so you are not repeating the same word. Just my opinion though.

"I loved her"

Maybe add a bit more to this, like answering the following questions: since when? why?

"she was the prom queen
i was the punk king
she wore expensive cloths
i wore whatever matched"

I love here the plain differences you mention, well-worded.
I can clearly see both of you and your descriptions are good.

"she drove a Mercedes Ben's
i rode my skate board
she lived in a white mansion
and i lived in the hood"

I like how you mention not only clothes and such, but cars and areas where you live, nice work!

"she got her nails done
i chewed mines"

"mines" should not be plural.

"she was miss perfect
and i was the anti
who knew two worlds
were meant to be"

Good ending, but there needs to be a question mark at the last line.

4/5 from me, a good write that stated your message clearly.

Take care and God Bless You!

~MaryAnne

That was a very good poem 5/5