Questions & Answers about Иногда мне не хватает мотивации в будни.
Russian often uses the dative case to show the “experiencer” of a state.
- Мне = to me / for me (dative)
- не хватает = there is not enough (of something)
So Мне не хватает мотивации is literally “To me, there is not enough motivation.”
You cannot say я не хватает, because хватает is 3rd person singular; it doesn’t agree with я. The verb is not describing what I do, but a state that applies to me.
Я не имею мотивации is grammatically possible but sounds very formal, legalistic or unnatural in everyday speech. Native speakers almost never say it in this context. They use:
- Мне не хватает мотивации.
- У меня нет мотивации.