Welcome Back!!! I'm a shiny newbie myself so still finding my posting legs... but I wanted to pop in and welcome you just the same. Every step forward is a step forward... I read something really great the other day, maybe it'll help. It's become my new mantra for if/when I fail : "If you stumble, make it part of the dance!"
We are all human, failure is inevitable because we are NOT perfect. As a Mommy to be your job was to become an incubator for the growing bundle of adorableness that was inside of you.. that is AMAZING!!!! Who cares that you gained the weight back, it happens, while that happened.. YOU GREW A HUMAN BEING!!!

Be proud in what your body did, and know that you'll get the pre-baby body back, it's all part of the journey.