Congrats, Felicity! A very much well-deserved pat on the back to you
gmantych, your comment also struck me...you CAN do it...just start where you start and go from there.
I also agree with nottango. Signing up for an official race would be a great step a few months down the road. I just did my first one a week ago and the experience is overwhelming.
You ARE stronger, you are athletic! Enjoy basking in your glow today!