I had decided not to mess with CO2 and just brought a mini-pump. The route was very hilly and I just didn't want to carry all the CO2 my cautious mind wanted.

As MP said, don't be surprised at how long it takes you. You have to go into these rides with a different mindset - what you can do on a century is entirely different once you load up your bike with all the extra gear, lights, batteries, etc. that you'll need. Don't get disappointed with how long it's taking.

She's also perfectly correct about your mind. I was ready to go back after 100 miles, for no apparent reason than I wasn't "feeling" it. I'm glad I moved on, even though I did give up when my knee blew up.