Getting too FEW calories?

I have only been doing my MFP daily food log for over a week. Each day I am so analytical about what I eat that I am not meeting all the daily requirements. I am trying not to EXCEED so I keep falling under, which isn't good either??!! Any suggestions? Maybe it will get easier as I go forward? I did WW before but I see why it did not work as well as I thought it would. It is because I counted points and did not eat the balance of the carbs, fat, sugar, sodium, yadayada. I actually like the MFP diary better, it is more realistic, I just have to figure it out before my metabolism sticks and I wind up starving and dropping off the treadmill.