Hey pradaboy - I’m in the same situation right now & have been for about a month now. I’m not in school so cannot relate in that aspect.
Usually this happens to me around Jan/Feb but this year its been since the end of summer. It hasn’t been particularly cold here (not sure where you live) but on top of the lack of motivation I feel cold & tired all the time. I just keep doing what I’m supposed to be doing hoping I’ll snap out of it.
You could have depression. You exhibit some of the signs. It could be a chemical inbalance. It could be overtraining. You could just be lacking something. It’s hard to say. See the doctor.