i really need some advice about school!?

I basically had to do a presentation on parli pro, and there are 7 group members including me well to day we had to do the presentation and my group members new there part when i got up there i had part of the presentation in the wrong place and my teacher stoped me and said i needed to switch it to another place so a fellow group leader offered to help so she basically said it was right and that i needed to switch one part and all of a sudden she said ill rewrite it and i said ok then later on i heared her talk about me and say she had to do it over for me . So now i already feel stupid that i messed up the presentation but, she made me feel worse so now im upset. Im not making any excuses and take the blame for the mistake but i really had no clue it was wrong because all that week id been asking group members questions and not the teacher because he always said let them help you