doctor said my baby is too large...

I'm feeling a bit overwhelmed. The doctor told me that my baby is measuring too big for the pregnancy age. This news has really got me worried, especially about the possibility of not being able to have a normal childbirth. I'm trying to stay positive, but it's hard not to let the fear and anxiety take over. I keep wondering if there's something I could have done differently or if there's something wrong. The idea of a complicated delivery or needing a C-section is really frightening to me. is it because i eat too much? is this all my faults?????????????