Cannot play at all

I opened up the launcher and it would only say play offline and not show the update notes even though i have an internet connection. When I click play offline it will open up fine and go to the menu. When I click singleplayer it will go fine, but when i click on one of my worlds it will crash and not load the world. when i click multiplayer, it will imediatly take my back to the launcher screen with no error tab or anything.