Is this true only for girls, or boys too?

I'm starting to see a gender therapist soon. But I'm not sure if it will happen fast enough. I'm ed, born male.. but I'm 15 and I'm starting to go through puberty more, I really DON'T want to be a man, I also have Type 2 Diabetes (from hereditary, I'm pretty healthy in all honesty) and I have to take Metformin, I heard it slows down puberty.. Is that in both boys and girls or just girls?