Ok, I've felt majorly confused lately. I am a girl, who likes guys, but I don't envision kissing one, having sex with one, just being attracted to guys a lil and having guy friends, y'know? With chicks, I envision myself being with one, kissing one, having sex with one, etc. I used to believe I was bisexual, but I now believe I might be lesbian? I have come out to few friends as bi, but I feel like this was a big mistake.
Just because you've told someone you're bisexual, doesn't mean you are obligated to be with guys and girls. It's not a mistake, just what you thought at the time.
Take your time, and things will become more clear. You sound more certain that you are more on the lesbian side of the spectrum, however it is not something you should rush and I am sure your friends will understand your journey of self-discovery. You could always say that you thought you liked boys only to realize that you like girls a lot more than you thought and that you like boys only in a friendly way.