Sounds like you want to be one of the Beatles in a year or two. Practicing four hours a day is demanding too much of yourself. It is amazing you haven't already burnt out. The advice of others to take a break of days or even weeks sounds good to me and I haven't even started taking lessons yet. I have had a nice guitar in the house for years and have not yet found the courage to begin seriously with lessons. I am 67 am "fear" that I won't learn it fast enough to become good before I die. I am in good health and not planning on dying any time soon. Please send me some of whatever it is that you have that compels you to practice hours each day and maybe some of it will rub off on me.
Good luck.
ToMarsh