Attractive?!?!?!?!?

ok, well i'm a lil short. about 5'1 maybe 5'2, and i love rock music. i play accoustic, electric, and b guitar. my grandma's boyfriend said that girls can't play guitar. he said "instruments were made to be played by boys. singing is for girls. thats why my daughter sings, and my son plays the drums." i was like oookkkkk old man, were in 2008, not the cavemen years. i am skinny, about 105, i have highlights, that are reddish brownish. kind of bronze i guess. i wear makeup, but only eyeliner. not alot, mascara, and lip gloss. i like rock music like metallica, guns n roses, system of a down and korn. lately, i have been trying to be more of a girly girl. wearing no eyeliner, fixing my hair different, and trying to get out of rock, but i'm not sure its working. should i really change? do u think all the stuff i'm into and i like are unnattractive for a girl? do i need to change?? please help me!!!