I don't know what I'm feeling right now??!?!?

It's like there's this huge weight on my chest, like the feeling of overwhelming sadness except there's nothing to be sad about. I can feel this huge urge to feel emotional but I don't know why...I'm just feeling the weight of the world. Maybe it's because I've been watching too many LGBT related videos and I've started to think about certain people in my family and how they'd react to my being gay. Maybe that's it? I don't know, I just feel very...exhausted, nauseated, crushed by this huge weight that will not go away.