I'm the same, people everywhere, including my doctors, assure me everyone is different. Sometimes it can go really quickly at first and slow down after a while, and others have the opposite experience. My voice has dropped so much in 2 months it's shocking. I am also stupidly attached to my hair and so I stare at my hairline in the mirror more than anything else on my face/head.
My advice is to take photos and that'll set your mind at ease for now. I've found I'm hyper-vigilant toward that and my hair hasn't changed at all, I never paid attention to the visibility of my scalp before. Not only that, but I wear my hair differently since beginning my transition, and my scalp shows a lot more that way. Talk to your doctor if you're really worried, the experience varies so much it's almost impossible to get a definitive answer.