Good morning, Saiy.
(1) I cannot think of such a word at this minute.
(2) What does come quickly to mind is a slang term or expression:
TOM: I don't need an education. I am going to win the lottery and be rich for life.
SUE: No way! You are only KIDDING/FOOLING yourself.
Have a nice day!
I found this word in the dictionary: Don't DELUDE yourself! You are not going to win the lottery/ marry that beautiful model/ be elected president.