Yourself is made up of two words, your self. It basically means you. Its not a hard word to understand.
If you were trying to say "me, myself, and I" then it means that nobody helped you accomplish something.
Details about you
it means to say what you want to say or Stand up for yourself like be brave to talk to a bully
when you are being in a rueful manner is to be with anger. When you are very mad at something Example: Ari was in a rueful manner because her cousins destroy her D.S