Need some thorough advice on this one?

all my life people in my past have known me as a boyish lez really into other girls and they have been "okay" with that, especially back in school and with comrades at the office. but lately, socially its not working for me, like on times where I want to talk to a crowd without them giving me strange looks and being awkwardly quiet. I'm jealous of my bro cause people like him and he looks good and it works for him. I'm not bad looking, and I dress well when I dress cute girly outfits, and when I act like a girl on a crowd who's known me for the first time its just an easier crowd to work on. BUT its not me. However I can see the real advantage of looking "straight." and i can see there's a possibility for me to be attracted to some guys. BUT I REALLY AM INTO BEAUTIFUL GIRLS even now, and I feel that if I make a transition I will lose whatever attraction is happening between me and the girls I like. sometimes I think i should just not give a F. or should learn how to be more real and myself, an open book to anyone? sometimes i feel like i should go with the flow, and sometimes I feel like I have to make a CHOICE. I do want to be a successful person one day who can influence and lead people and be someone great's GREAT CATCH, you know? love to hear your opinions. thanks