seeking assistance

theres this girl....she catches my eye in room full of people.i like her...and her sis says shes feelin me...but we walk around together and people start their littlerumors already and that makes her a lil uncomfortable...she a very nice person and i can only be myself ya know...im not tryna impress noone but im gon take care of myself...i never told her how i felt becuz she is probably hearing the same thing im sayin at least 50 times a day...so what do i do...do i say screw everyone else and just tell her how i feel or just go with what im doin now and just wantin to stay friends?she is makin alot of friends and her sis told me she has been hurt too much for her to wanna be in a relationship but she likes me...those are her sisters words...i need a little help with this one...i mean when i see her smile ill smile ya know...my attraction to her is far beyond anything physical...im attracted to her mind and how she carries herself...i would love to get closer to her...and be happy ya know...i see all the signs that i like her and i think everyone in school knows i at least likes her...when im with her its like shes the only girl in the room and we could be in the halls at school and these other females just disappear...if i could take a picture of her soul...i would do so.so can anyone give me a little adivce