Confused.

Hi everyone. As you can see on the left of this post, I identify as a bisexual. I've postponed making this thread, in fear of what the result would be. Some time ago, I've accepted that I was bisexual. And I loved it. I loved myself.

But soon after... I started doubting my sexuality once again. Just when I thought I was doing well. I had accepted my sexuality and came out to some people as a bisexual.

I've been thinking I might be gay. If I were, it'd mean I had to come out to everyone (7 people, not too many but still) again. I'm especially dreading the thought of having to come out to my parents again. Especially my father seems to be hoping I'm still coming home with a girl soon, that I'm not going to go for guys, and I could just feel his hope of me and my ex boyfriend breaking up when I told him we were dating.
The relationship with my ex boyfriend was my first real relationship. It felt good mostly, but sometimes I just felt this distance between us... but I don't know whether that was because it's a guy or not. I think it was just kind of uncomfortable cause this dating guys thing was new for the both of us. There was nothing wrong during bedtime, though. If you know what I mean. Also, while in this relationship, I'd sometimes notice girls and think like 'a relationship with a girl would sure be easier...'.

Now, about girls. I have always had crushes on girls. I'd get butterflies, would ask them out on dates, would kiss them too, but I never got any further than that. I want to though. I at least feel this certain curiosity, partly because I just want to know whether I'm into girls at all, but I'm not as attracted to girls as I am to guys.

Now I know I will get asked the following questions, so I'll answer them:
What do I fantasize about? Mostly guys, rarely girls. But it isn't like girls don't do it for me.
What do my eyes wander off to? I honestly look at guys as much as I look at girls. Roughly, of course. But I really do look at girls as well. I sometimes do feel physical attraction, too. Like those urges you get to subtly touch them while talking to them.

One more thing. After my last relationship, the thought of having a relationship with a guy just kind of appeals to me more than having one with a girl. While before the relationship I'd always think the opposite.

Now, something else... there's a girl in my class (college). I've known her since the second year of primary school, and we've always been friends/acquaintances since then. I've always had a thing for her. Was never sure what it was. I've never tried to date her or anything, but it has always been in the back of my mind. I'm seeing her often now, in school, and we're always having so much fun.
A few weeks ago we were on the bus, going home after school. We were talking about relationships and she said 'I would like to be in a relationship as well. You'd probably never have to be bored'. Since I had just gotten dumped by my ex boyfriend*, I completely shut off and I did not know what to say. I didn't know how she meant that, either. I was just like '...Yeah... You're probably right...'. I do think I'm interested in her, though. But since I was still hurt from the heartbreak at that time (still am a bit) I decided to let it slide for some time.

*She does not know of the relationship I had with him, which makes this harder because she knows me very well but not my deepest secret: I'm not (just?) into girls. She thinks him and I were/are just very good friends.

A week later we were on the metro with some other classmates and she was talking about how she never really gets feelings for a guy she is friends with, and that multiple of her guy friends have gotten feelings for her, and that she lost some friends over those feelings because she didn't feel the same way. She knew I could hear her.

To the point, though - I'm interested in her, not sure if sexually, and the things she's saying... what does that mean for me? Should I ask her out? Should I tell her I'm into guys before we happen to start things? Should I tell her after we do? Should I even act on these 'feelings'? If it doesn't work out... and even if it does... we're in the same class. Being in a relationship with someone from the same class has never seemed like a good idea to me. Plus, the thought has come up to me that I might be more or less using her as an experiment (to find out more about my orientation), and I don't want to hurt her. But I really want to find out, I just HAVE to experiment with a girl because I want to be sure. I feel like I can't be sure if I don't. I wouldn't mind to be gay, but I want to be absolutely sure before identifying/coming out as gay. I know some of you will say you don't need any experience to know what gender you're attracted to, but I'm just very confused. I really do feel like I can be a in a genuine relationship with a girl because I get crushes for them, but I'm kind of afraid it won't work sexually...

Thank you very much for reading.