Really, Really Confused... Need some opinions.

Before i start off with a rather long entry, i realize that there is topics of others who are confused, but, i want to have a thread for mine because i really need opinions, and you guys are the best option for me.

I am a Highly confused Bisexual. I have been for about a year and a half. hopefully in a not so long entry, i can explain to you the origins of my sexuality, and the big big confusion of it. Anyways

I knew something about my sexual/erotic likings was  not straight, but not gay when i went up to a friends cottage, while there we rented Valentine, I was eleven at the time. So we get back to the cottage watch it and whatever. The next day my friend and her brother and sister were talking about the movie... To which i said out loud, I think Denise Richards is Very Sexy, i would have sex with her in a minute. those were my exact words... long story short they laughed at me the whole way home and told my brothers like right away. A few years pass and i am completly boy crazy, like 24/7 all my thoughts are about guys... I turn 16 and a few months pass when i begin feeling sexual attractions to girls. I thought nothing of it, untill i pictured  myself erotically with a girl in my grade 11 drama class. I told my friend and she was like....maybe your bisexual. So i move on trying to not think about it, but with months and months, my attraction and erotic way of thinking of other females, grew. but at the same time, so did my attraction for men. I attended this party when i was 17, although my friend who is not comfortable with my sexuality for some reason, i was with this known party girl in the basement with the party, dancing up against each other, we were both non sober, and you know she looked like a cross between ellen page and rachel bilson, there definatly was a 'tension' going on, she brushed by me alot and also stared at me frequently. Long story short, we ended up kissing, making out  in the middle of the party room and everyone saw. so after that, towards the ending of august i felt comfortable with my sexuality, so much so that i told my mom i was bisexual. Now she is highly religious and a conservative, so she told me, i am not bisexual and i am just making myself think im bisexual. From that point on. My sexuality has been rather confusing for me... i went months thinking that men were sexy, then i would go months thinking females are sexy, then it would like flow in and ou, one minute id be saying im straight, next im bi..but i dont truly know what i am. one friend is very pissed off with me because of the fact that i am confused about liking both men and women, she thinks its no big deal.my  other friend is saying that if i can picture myself having sex with men and women then she thinks i am bi. I feel bi but something is totally confusing me and i wish i knew what. Olivia Wilde is really not helping! although thinking about her makes me feel....hot. and then thinking about Eric Balfour makes me totally hot to.

my confusion is in the sense of my 'flowing' sexuality. i dont know if anyone here would know what i mean by 'flowing' sexuality, but opinions would be nice, i really want input.

thanks..