What Am I bisexual,gay,or strait

This is going to be long. and i would like if you guys reply.

I have always liked girls I had dreams of being with girls, basically I was as strait as you,and I was really and i mean really sexually atractted to girls. i started jacking off when i was in grade 6 i would do at least 2-3 times a day. people have always told me I'm more aware of things than most kids of my age.so anyway one day i was with my friends and I got one of those moments when its cold outside and your nipple gets hard and your shirt rubs on it and its annoying. I said to my friends do you guys get that feeling and they replied,"no are you gay or something"? and that is when  it started. I  got this feeling where I sarted to breath heavily and i ran to the wash room and started to worry what if i'm gay this went on for a while 

until it stopped and one day i was watch a movie with my sister,well i fell asleep on the couch and she was watching the movie and i woke up and was too lazy to go into my room so i stayed and watched the movie with her and there was this scene where two guys were having sex and that really spiked me again i start to get all sweaty and was breathing heavily again. at the time I had no idea what anxiety was so i was freaking out. But before all of this I had an anxiety about cancer but again I had no Idea what anxiety was.

but I the feeling I got was similar to the feel i got when i thought about cancer. Anyway after my sister finished watching the movie she said to me, "i hope you turn out to be gay so we can go shopping together" and you know what that did to me, anxiety.that was the winter of 2011 and that is when it all started to happen I don't know if you guys know what HOCD is but if you don't go look it up.Yea so in Jan. of 2012 I started to get these unwanted thoughts of two guys having sex and this complety freaked me out and Told my mom I  was 12 by the way.Then it went on for a long time I would get a though a get a feeling after it an anxiety typo of feeling. I went on from Jan. to Nov and through out that time i had no attraction to girls in my class I didn't like anybody for 11 months and freaked me out until it suddenly stopped i don't know why it  suddenly stopped and i was all good with non of those thoughts until late may when it started but this one was different any way i'm here right now and writing this and i just watched gay porn and i got turned on by it and jacked off to it but the thing is I also can jack off to straight porn but I don't get turned on by it and i feel like i like this girl but i don't know if i do or not i haven't liked a guy the way i did when i liked girls actually i haven't liked  a guy This is wierd  but i keep thing i like one of my guy friends but i really don't i get this feeling its kinda like and anxiety one moment and then different another and right now i just don't know if i'm gay or bisexual or if i'm going through a stage or i got tired of normal porn but why am i getting turned by gay porn two days ago my penis would have just shrunk i don't know whats wrong with me i'm if anybody knows whats going please say it.