Anne thinks peter has an inferiority complex. find examples in the diary to support that idea

Peter mentions  thinking about converting to Christianity after the war, this will make his life easier. Anne thinks Peter has an inferiority complex because of this. 

In Anne Frank - The Diary Of A Young Girl

Anne told Peter that he has an inferiority complex. She wrote this on her diary dated Wednesday, February 16, 1944.

Her diary entry reads:

"After I'd explained some French to him, we began to talk. He told me that after the war he wanted to go to the Dutch East Indies and live on a rubber plantation. He talked about his life at home, the black market and how he felt like a worthless bum. I told him he had a big inferiority complex."

"Peter has a huge inferiority complex. For example, he always thinks he's so stupid and we're so smart. When I help him with French, he thanks me a thousand times. One of these days I'm going to say, "Oh, cut it out! You're much better at English and geography!" "

Hope this helps!