I just don’t know

So for the past couple of days I’ve been feeling really sad. I just get sad out of nowhere. I don’t know what’s wrong with me sometimes. I just want to cry sometimes. I shouldn’t be feeling like this because I have a roof over my head. I have a lot of people that love me and everything else. Idk if it’s my lifestyle because it’s so routine. I go to school and work and go to sleep it’s like a cycle. I do go to church sometimes.