Anybody feel like they have to make up for not talking?

Anybody feel like they have to make up for not talking? I told my teacher that I don't want to do presentations. She told me it was okay but I still feel kinda guilty, because my friend speaks for me. Anybody else feel like they have to make up for the fact that they don't have to speak? I feel like I have to do twice the school work to make up for the fact that I don't have to do presentations. Or that whenever a friend speaks for me I feel like I'm using them even though I'm not.