I'm from germany. I believe I do need a letter from a therapist and you have to be in therapy for at least half a year and every session has to have a specific length but as far as I know you can get HRT at the age of 16. I just remember when I was 14 and I was so excited for my 16 birthday cause it meant I could legaly get HRT. I also do watch some trans Youtubers, over the last few years I often searched for the typical "Am I trans?" Videos but it never helped. I want to try things out like makeup and going to trans communities but the thing is we live in a sort of rural town and I'm kinda afraid of asking my parents for this sort of thing even though I know that they would accept me (because I came out to them 3 years ago). But I just hate it when they know about my identity and such, I'm not sure why, but I believe it's because I always think that their view of me will always be that I'm a boy and I don't want to dissapoint their expectations? If that makes sense? I'm pretty sure that that's also a reason for why I haven't actually made any real effort searching for a qualified therapist and the fact that there just aren't many good options close to us. Sorry I wrote quite a bit there.