Tool issues (Can only break specific blocks with specific tools)

Now sometimes when I try to break wood with my fists it doesn't work. I have use an axe. Nothing else works. Same goes with the pumpkins and melons.
Same with stone blocks, I can only break them with pickaxes. I can't punch them until they break.
Same with sand, clay, and dirt, (shovel blocks) I can only use a shovel. I can't use my fists or any other tool.
And I can only use shears to break leaves.
I can't break pistons at all.

I tried reinstalling Minecraft, but it didn't work of course...
Uhm?