But after you gained ten pounds of muscle and looked more aesthetic and then she liked you could you honestly accept her then or instead go for a girl who didnt see your previous image or one who doesnt care? The goal for me wanting to working out isnt about really attracting women but to help myself be more confident and less of a stick out. Also, there's the personal image I have of being that beefy guy banging a girl....visual stimulation I think. But if a girl suddenly approached me looking more beefier when she had noticed me before, I might have a bit of a disgust or turnoff.

Why not just enjoy your time and fuck that girl ? You won't marry her, just have fun, and it seems that's what she want too. It will boost your self-confidence too.