Ungrateful?

I think, it is just me against myself.
For the passed few weeks, I've been randomly getting upset over petty issues with the bf. Late calls, late replies, not enough attention from him...and the list goes on.
I don't know why, I'm just so filled up to the brim with negativities, that at one point, I thought I was suffering from depression, or rather, maybe I did actually suffer from depression?? Who knows.
Sobbing over webcam, complaining about the bf's lack of affection and lack of attention had been a daily issue until at last, thank God, I finally came to my senses that I need to have a life of my own. Either that, or I'll need to look at things on a different perspective. I thought it over and over, I told myself, I've gotta do something before it's too late.

So far, I've been on very good track for one week already, and I can see the bf is enjoying our webcam session recently.
Sometimes, I do feel ungrateful. I don't know why all the fuss over insufficient attention and the inadequate time allocated for me, when I think, he has done, what most guys can't do, or rather prefer not to even try doing.
It is a daily routine, out of willingness, not demanded from me, morning call to inform me he is up, and going to class. 11am+- he'll call to tell me he has a short beak. 1pm, another call to tell me he is having lunch break. 2pm+-, call to inform me he is going for class again. 4.30pm, call to let me know his class has ended. Rush home, webcam a short moment with me, then it will be my bedtime, and his dinner time. I'l sleep, wake up early in the morning, which is his night time, and webcam for another half an hour to an hour, depending on his mood, and mine.
And despite all that, I go about complaining that I feel neglected, Every. Single. Day, without fail.
Sometimes, I wish someone would tell me how to feel happy now, be thankful for the present, and stop worrying shit bout the future. Cause, obviously, I'm having a wonderful present, no?
All I care about, day and night, is to worry whether there will be a day that he'll wave goodbye to me for someone else. At times I get so pissed off at myself, because why wouldn't it be that one day I'm the one waving goodbye to him instead? Why must I be so negative? And why wouldn't it be that I'll be happily married to him instead? Why must I surround my thoughts only on how people will hurt me, and how I'm so destined to be unfortunate?