Hello Seth, welcome to Susan's!
I am MtF and it took me years to realize that. I think you're asking great questions and it's best to take the pressure off yourself. Don't try to immediately come up with a perfect and final answer on things that are so important. Even if you decide to make changes, many of those can't be immediately accomplished - takes time.
You probably already know gender identity and gender preference are completely unrelated. One thing I didn't understand earlier is gender identity is not purely a male/female answer, that's why it's called a gender spectrum. That's another thing that may help reduce some of the pressure you are feeling.
I'm glad you talked to a therapist and I hope they are a specialst in LGBT topics. If they are not, I recommend ask them for a referral.
Another way to think of the question "What if I become trans" is re-word it and see how the question sounds. "What if I need to change in order to become my true self" shouldn't trigger as much fear. The answer needs to be approached objectively and without bias.
Questioning everything at the right point in time requires initiative and intelligence. Nothing wrong with that. It would be impossible and wrong for me to diagnose you, but many members here have discovered they had a wide range of issues that were caused by gender dysphoria. In my own case I now believe it contributed to my years with too much alcohol and other mistakes, so many missed opportunities connected to that. I am not going to tell you to what to do (I stopped drinking in 2003) but I hope you can understand some things are irreplaceable and too precious to waste. Maybe that's why getting drunk is also called getting wasted.
I am skeptical of surveys and lists that provide "correct" answers. Based on what I know about myself I have learned they are often wrong for me.
Susan's Place has some unique requirements so we always provide additional information to new members. I'll add it here for you.
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Things that you should read
Seth, thank you for joining. And your English language skills are excellent. I partially learned a couple additional languages and admire anyone who can be fluent as you are.
Kendra