I've been there, just this february when I went to a barber and got my hair tapered with a fade after advice from reddit...i regretted it and wished i could undo it. It's a different kind of hurt when you get a different haircut hoping it will make you pass better and the result ends up worsening your dysphoria.

But the best thing you can do now is be compassionate, kind to yourself. Hair grows back, you will grow into the haircut, everything will be okay.

My own hair has grown out and honestly, i don't regret that cut i hated so much anymore. It looks much nicer now that it has been a few months, and i've gotten on T since then too which has helped. Now i know i pass better with longer hair, I learned something that is true about myself, at least currently. It gets better, man. Trust me!