How to make sure I’m not in an echo chamber

I had my first doctors appointment today and he said just be careful only being online and stuff because you might be in an echo chamber and people can have their own agendas.

I’m pretty confident I’m trans. I can’t picture being happy as a man especially not as an old man. At the same time though part of me doubts it what if I’ve made this up for attention what if I’ve somehow been manipulated into it there’s just a lot and I’m not sure what to do.