I know exactly what you mean!!! I wasn't ready for a continuous run that long. I actually skipped that day and went right to Wk6 Day1. I figured, no biggie as long as I kept getting out there and trying! Then I repeated Wk6 Days 1 and 2 over and over for a couple of weeks before moving on to Wk6 Day3 (running for 22 minutes). I'm on Wk7 Day3 now!
I'm 58 years old and had not run for about 30 years, so I decided to cut myself some slack! I look at this program as a great suggestion of one way to get you to running 5K. It will not be perfect for everyone. Use it as a guideline and modify it if you need to to make it work for you. Don't stop running because you didn't following the program exactly!