My minecraft keeps crashing, and won't open.

My minecraft just opens, I see the logo, and then it says "Not responding." It stays like this forever, and then eventually crashes. I've tried my brothers account, same thing, different WiFi connections, 3 different computers, a desktop, laptop and a touchscreen, and all don't work. I don't know if I'm cursed, but I've had this problem for a day now. I'd really like if someone were to help. I'm getting annoyed, please help.