Is it normal to keep track of pretty girls i see on a daily basis?

I take the train to work in the city everyday so I see a lot of pretty young ladies on the train, in the subway, at the station, and walking the streets. I try to make a mental note of every pretty girl I see and write it down like a journal in my phone. I just want to know if it's normal. For example, today I wrote down:

Short blond-ish girl about 5'2 in subway train standing to my northeast, got on and off same stops as me
Blonde girl about 5'6 sitting next to me in train from Secaucus
Tall blonde girl about 5'8 with her hair in a bun / ponytail who got off from train and was on the escalator a few steps in front of me
Blond-ish girl who swiped her metro card before me while I was hesitating and then I moved to the next one to the right
Tall blonde girl about 5'7 standing at platform
Brunette girl about 5'4 wearing tight dark blue jeans and standing to my northwest in subway train while I was seated
Blond-ish girl about 5'5 in red suede boots standing in front of me in subway train while I was seated, she sat down next to me after the man to my left got up
Petite brunette girl about 5'0 in green jacket who was walking in front of me at 56th street
Short brunette girl about 5'1 with red nail polish standing to my northeast in subway train while I was seated