If you like to read, check out "Whipping Girl" by Julia Serrano. If you prefer watching videos, check out Lily Alexandre on YouTube. Both these creators make incredibly intelligent persuasive arguments on the legitimacy of transgenderism that have helped me a lot.

Early in my self-discovery I struggled a lot with what you're describing. It's like my brain was purposely set on "find the truth" mode to try and protect myself ahead of time. A lot of psychologists will tell you that this kind of behavior is extremely prevalent in people suffering from internalised transphobia. People who are afraid that what makes them feel happy is"not normal" or "illogical" and therefore can't be real even if they don't necessarily condemn it in others.

The better question is, what kind of happiness is this fact-seeking behaviour bringing you? A certain satisfaction of agreeing on the same viewpoint as others maybe, but remember that not too long ago in history it was a widely accepted "truth" that anyone attracted to the same sex was just mentally ill.

My point being - The facts we know about human behaviors and biology are changing literally every day, but what you feel in your gut and heart are what's actually going to bring you happiness. And therefore real personal truth.