My hoe wont work

Today I tried making a garden and when I went to use my hoe to make the garden whenever I tapped the ground it wouldnt work, I even tried putting water right next to it and nothing would work, also whenever I try to change my worlds to creative or survival it wont work, example:if I create my world and its creative when I try to change it to survival it wont work for me but if other ppl join my world it will be survival for them. Minecraft has been really frustrating me lately.

Irishsoccer99 about Minecraft: Pocket Edition, v1.1.5