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This is way out of my scope. But I wish you the best, and want to lyk that you'll figure it out

I can tell you're carrying a lot right now. I actually went through something similar with my OCD. Mine latched onto questions about who I was, and I became convinced I had to figure everything out with 100% certainty before I could move on. I spent hours researching, checking my feelings, and asking for reassurance. It never actually made me feel better for long. That's what stood out to me in your post, not whether you're bigender or trans, but how much your brain seems to be demanding certainty. You even said, "OCD really makes me feel like I need to be certain." I don't know what your gender identity will ultimately be, and I don't think anyone online can answer that for you. But I do think you deserve to explore that question without OCD constantly hijacking the process. I'd really encourage seeing a therapist who specializes in OCD and ERP. Not because they'll tell you who you are, but because they'll help you separate your genuine feelings from the anxiety that's demanding an immediate answer. You don't have to solve your whole identity today. It's okay to let yourself learn who you are over time.

Because gender is such a murky subject anyway, you can always find rationalizations as to how you "could be trans" because the current culture around gender is flippant and leans towards affirmation. Honestly had this for some time too and I’m happy as a straight, man. It’s a phase and will pass, trying to diagnose yourself or look up ‘signs’ of it will help in no way. It was consuming my life for some time but it’s just a thought and it doesn’t mean anything so you don’t need to believe the thought.