I'm so sorry that you're finding yourself in a position where you're afraid that your sexual orientation means you can't live according to your faith, or that it puts your soul in jeopardy. Before we do anything else, I want to give you this resource: http://queergrace.com/
. Queer Grace is a site by and for LGBTQA folks who are also Christian, and does a really good job of offering alternative interpretations of scripture that might be really helpful to you right now.
Too, I want to offer you something queer and trans Christians I know have said. That is, that their sexual orientation and/or their gender identity is part of how the divine made them. Does that make sense?
As to your questions about your orientation, how (or if) you choose to label it is up to you. If you're noticing you feel attraction to more than one gender, then that is often an indicator that you might be bi, pan, or some other form of queer. I think this article might be really helpful as a starting place, especially the section about questions that can help you sort through your orientation: The Rainbow Connection: Orientation for Everyone