@Jamie
The only "cure" I have seen for crossdresers and fetishists of various kind (including myself in the first category) is to have a partner that understands and lets us free to choose. Obviously I am not talking about an actual cure for something that is not a disease, but a way to be more at ease. I am a CD but since I met my wife, that lets me crossdress as much as I want, I don't feel the need as much. I wanted to try and grow some breasts as a fetish but when I stopped and slowed down she kept giving me pleasure from my nipples and I realised that stopping the growth was ok because I already had the feeling that I wanted.
But that is if you have a fetish, and not proper gender dysphoria.
You are very very young. If you are transgender this is a good moment to transition because your body is not 100% set on being male and it can grow into a beautiful female form. To be honest, your body looks more feminine than masculine to me, and that's without taking the breasts into consideration. At the same time, being transgender is not easy and it definitely doesn't fit into the stereotypes of been a young adult that society pushes on us. Many young transgender people end up harming themselves because they can't put together the way they perceive themselves with the expectations the world has for them.
I think I read in a previous post of yours that your parents agreed on you taking herbs, that was at the same time weird and very open minded from their point of view. They may know something about you that you don't fully realise yet. A gender therapist may definitely help in this case, even if they hardly see the difference between agender, transgender and queer. I don't know in which category you fit, and apparently neither do you.
I am very bad at giving advices but I insist on this one: look into your relationship and try to understand if you can be happy as a guy with a girl that rejects part of you. Mind, I believe that love comes with sacrifice so I am not saying that this is impossible or less rewarding. It is also true that it's harder for a "man with breasts" to find a partner in a world of vanilla people with standardised expectations. It is easier for a transgender girl, than an "inbetweener".
Bottom line: pause the breast growth if you feel it's the thing that gives you more space to think, but look deep down into your feelings, even with the help of a therapist, to understand who you are. This community will always be next to you, with or without NBE in the way.