This shark experiment will tell you a great lesson that lots of times we put barriers in our mind by our own.
Recently a marine biologist did a research experiment. She first put a shark in a big tank and also put some bait fish in same tank. The shark quickly ate the bait fish.
Then the marine biologist then put a fiberglass into the giant tank which separated the shark and the bait fish.
The shark started hitting the fiberglass and realized it wasn’t working. The shark hit the fiberglass numerous times but failed each time. After that the giant fish just stopped trying altogether.