Why am I sad?ㅠ

Why am I sad?ㅠㅠ (1) Because tomorrow is Monday (2) Because I don't get much of 'that' every day at 5 AM (3) Because weekends go by too fast and it makes me sad (4) Because I get little "tip terror"(?) (5) Because I watched a sad video (6) Because I have to endure another 5 weekdays (7) Because I stayed up all night(?) (8) Because my parents scolded me a lot (9) Because it's raining today and I feel like my heart is raining too(?) (10) Other (Because of a different reason) (If you don't know, just guess.)