Help with attraction and stuff.

Hey. So I'm 16 and a female, and I also happened to be confused about pretty much everything to do with my sexual orientation. I've been trying to figure things out since 7th grade, but to no avail. Alas, I do not wish to spend the rest of my high school experience puzzled out of my mind or in a closet, so I come here seeking advice. Keep in mind that I have always struggled with building even platonic connections with people, and find it difficult to establish any relationship in which I 'want' to be around that person. So that may or may not affect my experience.

Let's just start off by saying that I haven't had very many 'identifiable' crushes. I have had one crush (w/ butterflies) on some guy in middle school, but nothing else similar after that. I will find myself having an interest in getting to know certain boys in school, and appreciating their features, but I feel my attraction to them only goes so far as friendship, or perhaps kissing. However, I have been told that oftentimes crushes will develop further once the initial 'getting-to-know-you' part is breached.

With girls, I am even more confused. There have often been girls in my childhood that I will look up to, will feel an intense connection with, and will get an excited feeling in my stomach when thinking of being friends or girlfriends with them. However, it is difficult enough for me to want to make friends with anyone, and I often end up dismissing both possibilities.

I recently became aware of the fact that I probably should have had more crushes at my age. I know I am interested in a sexual relationship, but am unsure of with whom. The butterfly feeling in my stomach when looking at pictures of celebrities only comes when I feel a connection with the character they play onscreen. When I see men shirtless (no matter how attractive they are), my first reaction is usually me wanting that shirt back on. I can appreciate them better with clothes. With women, it doesn't matter how little clothes they have on, because I will likely picture having sex with them. Is this sexual attraction? Can I experience attraction without arousal? What does arousal feel like? My guess is it's that fluttery heat you get in your stomach and that pressure in your groin. Yes? No? You see my naivety and confusion.

I can picture myself having sex with men, but the thought is almost disconnected, in a way. I have no desire to even look at a penis, much less touch one. A vagina seems much more welcoming, and a woman inviting. The thought of being with a woman romantically and sexually is inviting. I love the feel of kissing girls, but I have not kissed a guy. A deep guy's voice sends shivers in all the right places, but so do girl's voices.

Basically, my hope is that by the end of this year, I will be able to confidently say one way or another whether I am lesbian, bisexual, or straight (or a combination). But should I be concerned about my lack of interest in a specific person? Sorry for the long post, will you help me?