Sexual, cannot concerntrate. Normal?

1) I got married at the age of 27yrs but I have 2 sons. i used to masterbate at age of 12yrs. I am having sex daily 2 times morning 1 - evening 1 times daily one time i have to masterbate one time daily also wife is irritate due to this. If I see matured fatty chhubi ladies I will be more exiting for sex in week I have to do sex 18 times in week. I am satisfied with my wife of look n body but not sexual excitement Now I am not able to control myself even crossed 40yrs. I am dreaming for couple having sex in front of me and I am enjoying by watching for the same Is this normal? I am feeling weak I have bp avg 140 not taking 💊 I couldn't concentrate on job I am suddenly forgot ting I am feeling alone n always fearing My mother had cancer and father had asthama I am non smoker non alcoholic If I do mistakes I feel very bad. It hurts me too  much From last 1 year my hair I am taking more tension I have more responsibility of home n office I am working at pvt co as manager Pls guide me