I need *help* to define my sexuality!!!!

I am 22 year old male. 5'5 and Latino.
My question here is I am not sure what I am for my sexuality. I have dated women all my life so far and have had sex with women with no problem. My relationships go to down hill cause I get bored easily and I'm hard to keep intrigued. I had a experience with a male once in middle school and I did everything but had a-sex ( I pitched only). I liked it all and we had a few more times. Then he told people but it was supposed to be our secret. Then in High school (freshmen year & sophmore year) l I flirted with a Gay guy in my math class and he'd rub my leg and it really turned me on and we use to text and talk all the time. we almost dated till I told him I was scared cause I wanted to be with him without people knowing cause I was afraid of what people thought and I didn't want people knowing. I guess I was kinda of ashamed of it. We never did. To this day I find a sexual attraction to males (only the fem/pretty boy kind) but I am not sure on an emotional level if I could. I see gay couples and I'm thinking aww that's cute. I feel straight majority of the time and have sex with only women. I sometimes get female tendencies such as: walking sometimes, sitting, some words I use. I'm not sure what it means, but I am a typical guy though. I am in the US Army as an Infantryman, but attracted to no one in my unit except for a Medic but he's in a different Platoon. I act and talk like a straight guy at least cause that's how I am, but it doesn't explain the female tendencies or actions that pop up sometimes and when I see cute guys out and about I just get all slightly girly ( in my head). I think I'm bi-sexual but I also read about that straight guys can have sexual attractions to men sometimes and it's normal. I don't know what is right or what ever. I'm not sure what I want or if i'm covering something up or if am more leaning towards women or towards men. There is a lot of confusion and I'm just not sure about anything anymore honestly or what's real. Today I saw a male on a public train and he was a few years younger than me by the looks of it but he had fitted pants and a nice shirt and he looked really good and had a nice rear and I couldn't help but stare when we got off the train and I was behind him. Part of me wanted him to notice me and smile or do something to get my attention (btw I dress in a regular t-**** and jeans -casual dress). On the other hand, when I see fine ass chicks, I sometimes think the same thing in hopes that one will notice and I know I am a decent looking guy ( I'm not ugly I know that much) but girls are the same way I think F%&K I would totally Bang that chick especially red heads ( emma stone, I'd marry that chick lol). So I'm going to stop there I think that is enough info. Please help me I really don't know.. Also sorry that this so long =/