okay here is the story.
I messed around with a girl a long time ago, we never had sex but a couple of times we did fool around. That has ended and it was a long time ago.
I have met this new girl and really like her, she was from my school in my class so I know her well, we just never talked before now. She does not know I like her but she is everything I like in a girl, shy and sweet and likes manga.

It turns out this new girl is sisters with the girl from before, I am so depressed about this because it means we will never work... or does it not matter, could it work between us?