What is my sexuality? (I'm a girl)

I've known for a while that something has been up with my sexuality. I go to an all girls school so I've never had much exposure to men. I remember I'd look at videos of girls kissing in as early as grade six just for curiosity and I'd enjoy it? But I wasn't sure about my feelings. In grade seven, my friend was also bisexual and we were very close, and she had a thing for me but we were both naive and unsure and I also at that time, had a huge thing for this guy. I couldn't commit to my bisexual friend because I knew that I had some kinds of feelings for this guy and I couldn't make myself love her. I ended up confessing to the guy but he rejected me, but now I think I was just desperate. In grade eight, new girls game into our grade and I remember having crushes here and there on different girls and it drove me insane. Even to the point of obsession over them, but I hadn't accepted my feelings so I just made excuses like "Oh this is just a one time thing", "I'm straight but I have this exception for this one girl..". Just recently, I've been condoning the fact I may be entirely gay? I like girls and can connect to them emotionally, I'm not sure about sexually but maybe if I loved them enough.

And for guys, I'm not attracted to them emotionally but I think I might be physically... The thing is, I am very certain I am attracted to girls but for some odd reason, guy's dicks turn me on (when they're hard). I think I may have penis envy... I can only get off to seeing a dick, or imagining that I have one. I don't necessarily want to suck it or anything, but I like the idea of having one. (I really don't want it to be that way for the rest of my life though, which may affect future relationships I want to have with women. How can I stop this penis envy, and getting off by imagining I have a dick?)

So the main question here is, am I bisexual, or gay?

And for my penis envy case, does that make me transgender, or just envious? Will the envy affect me for the rest of my life?

I am so confused. I want to come out to people but I can't because I don't even know what I'm coming out as. I like girls but I get turned on by penises.