Humans are fragile, they are unable to handle too much emotional strain, likewise this is also the case for physical strain.
Take the world wars for an example, heck they were the reason why theres even awareness to mental disorders, when the wars ended it still left a strain like Shell Shock (PTSD). And do you think those people are weak minded? They simply saw too much way to fast for the human mind, they didn't have a choice.
Just like what OP is having (albiet less extreme than the example that I was telling).
And with that kind of thinking is the many reasons why some sick people choose to not speak up, Because they know they'll get hurt more.
I think the problem is that, its not increasing, people are getting more comfortable speaking about them. And knowing that there are more people like them combine that with Internet anonymity, suddenly you have alot of *sick* people.
And for the looks of it OP is just overwhelmed with emotions, maybe they're becoming (or is) a teenager and their brain is still unable to process whats happening at the current rate
Life is unfair. Thats the fact, if life wasn't unfair the world population would be 10bilion, there wouldn't be climate change, there wouldn't be wars, and there wouldn't be any world hunger. But that would be boring
Course I'm not saying these feelings are nothing, we all felt it at one point, but good always happends, and you just need to keep moving forward and presevere.