Eva,
I'm also female-leaning pansexual (apparently that's what you're supposed to say instead of bisexual now?), and I've actually found it easier to date girls than guys. A big part of it is politically and personality based; other women tend to be more willing to have an equal relationship where neither partner is dominant or submissive; being an equal to whomever I date is important to me, and it should be important to you too! Women are less likely to be transphobic. And, I tend to prefer people who know how to dress themselves, and not to enforce ugly stereotypes, but men usually aren't the best dressers. Still, for the right man I'd melt in a heartbeat.
For me personally, finding someone of any gender who wants me is a struggle; I'm not going to lie, if you transition, you are going to have a much harder time finding partners. That's a risk I may have not thought about enough going into this, and I truthfully have some regrets wrt my transition because of this. Going through life alone is a hard thing, and it's a reality we all face as trans folks. But just keep an open mind, and you may well find someone you love and if you're even luckier someone who loves you back. And not being picky when it comes to gender can really help you.
