Hi Snuffy, it's nice to meet you.
You remind me a lot of what I was like in high school. I didn't consider the possibility of being a lesbian, but I certainly felt safer with women and had an aversion to men. High school boys, of course, are a indicator.
Honestly, you're still very young and have so much living and experiencing to do. I wouldn't recommend pigeon-holing yourself quite yet. Be open to positive relationships, regardless of the gender of the person. You may find you are bi, or lesbian, or straight, but you don't need to set it in stone.
I consider myself a lesbian because I'm in love with a woman, with whom I have a committed relationship. This does not mean that I don't find some men attractive. I think it's a mistake to to think of sexual orientation as being solely about sexual activity. If it was only about sex, it would be as easy to change your orientation as it is to pick a new fantasy. For me at least, it has been about my emotional connection to an individual, the safety I feel with them, the natural inclination I feel to pursue deeper levels of intimacy. I always feel this with women.
So try to be lenient with yourself. Take your time. Explore your feelings. You're way too young to rush things. Your brain doesn't finish growing until you're 25, and you will change a lot between the ages of 18 and 25. Give yourself the freedom to test your feelings and get to know people.
Above all, be safe, and take care of you.