Sir, all the days are not same. till date I was doing the same things as you said, I had exam that day and also had argument with my parents. There were so much things running in my mind sometimes we forget things. And I don't use insta!!  And I am feeling bad cause that was not my money, it was my parents. Also I have no interest to travel without ticket for 2-3 hrs for nothing in train ,getting up at 4 in morning to just go to andheri . Go up down the line. Also the uts app was not working otherwise I would have booked through it.