I don't know how to explain it

So I went on Minecraft today and when I tried to get a block in Creative mode it picked up 64 blocks and when I tried to place it in my inventory it wouldn't work. In Survival, I can't break blocks or anything (The same thing happens in Creative). I tried restarting my laptop and deleting the game and downloading it again and nothing has worked! If someone could please help me! I can't even take things out of chest and it's really frustrating!