Why am I still gaining weight??

I've been changing my diet, eating more proteins (or well I am trying), taking inositol and vitamin D (starting off a bit slow), walking at least 7k steps most days, and I keep seeing the numbers increase. I was thinking it's probably due to what I'm eating but I don't know what else to change so I was thinking of just cutting down on amounts, I don't know I'm only 17 and diagnosed around august. This is draining