ok, this isnt the mens chat, so i shouldnt get kicked out for this. lol.
really, as long as you keep it clean she shouldnt care. my boyfriend isnt circusmcsized, and he just came out and told me. its totally not a problem, and i was never grossed out by it. as long as he keeps it clean its totally fine!
there isnt anything wrong with being uncircumsized, some guys are and some guys arent. try just telling her, and if she has a problem with it, she isnt worth it. if she really cares about you and/or loves you, she wont care if you have a foreskin.