Board Thread:Game Help/@comment-26485587-20150611041101

So I was playing Terraria on my iPhone 4.Then I went to take a shower but when I came back my character disappeared and was replaced with a character named "Student" which I did not create. At first I was angry but I remembered I had some extra tools in my world but when I joined my world it was replaced with the tutorial. My game was downloaded onto my iPhone with my friends account and nothing else. Please help me D: 