Why do I always start crying for no reason?

So, I always cry for no reason. Like I am just in class listening to the teacher, watching a video, or talking to a friend and then suddenly tears come from my eyes and I'm not sure why. I also could be drawing or listening to music and then I feel tears down my face and it makes my headache soon after. I'm not sure why this is happening, but some people I've told say it's very unlikely that it is serious or a disorder of some sort but I don't think that it is that unlikely because nobody I know has this problem- and I know quite a lot of people (even if I don't talk to them that much, I just find out.) Sorry if i am bad at explaining, it's not really my speciality. However, if anyone could tell me what may be wrong with me, I'd be grateful. Thanks.
Why do I always start crying for no reason?
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