Toban, your training sounds really sensible, similar to how I worked my way up to running in the first place (7 years ago, and I had never run before in my life, I trained with Team in Training to do my first half marathon).
Even after three half marathons and a few other running events, I still didn't think of myself as a runner or an athlete. Even after riding my first century bike ride or riding across the entire state of Iowa, I still don't think of myself as an athlete. It's funny how much it takes to overcome the "imposter" syndrome. Even though I'm not fast (especially when it comes to running!), I get it done. So I totally understand what you are saying! However, I never did ANYTHING athletic ever, other than swimming some laps and leisurely bike riding, until I was 45. I astounded myself and everyone who knows me well by taking on the challenges I did. So I'm seriously applauding you for resuming this!
I think about working my way back up to at least a 10K. I stopped running any kind of distance after my hysterectomy a few years ago, and have never stepped up the level of training I did back then. I lost weight while running but not while cycling, although I think cycling did good things for my legs. Now I'm doing more yoga to get a more rounded full-body workout with more stretching and flexibility, because last year I had a shoulder issue that got in the way of pretty much anything. I feel like I need a new challenge, but I don't know what it should be! Your story is inspiring to me.