You're simply enthusiastic. :)
Just listen to your body - and your doc - and allow yourself to build your endurance and mileage as safely and injury-free as you can. We're all going to hurt ourselves, sometime; hopefully not from overuse or overtraining. :)
My daughter did the Austin Half, I did the full marathon. If you know the Austin at all, it's a very hilly, ergo challenging, route. She did just fine, this being the 3rd time she has done it.
If you think you can walk that Big D Half Marathon, go for it. You've recently done a half marathon, so you know you can.
Then , you won't be beating yourself up so much, LOL!
"Life is like a banquet, and most poor suckers are starving to death." Auntie Mame
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