Puppy likes walks until I enforce boundaries.

I have a 3 month old giant breed puppy. Finally got the all clear to go in walks, YAY! The issue is weird or maybe im weird.

Shes always rearing to go, sniff, and watch the world but as soon as I start setting boundaries (not letting her eat stuff off the ground, not pulling, not allowing her to run up to strangers or other dogs) she seems over the entire outing quickly and then just she walks as slow as possible as if to protest the restrictions lol. And its not like we go far, its 15 mins tops and not at a brisk pace. Never had a pup ''pout'' like this.

We do work on focus skills and what not but shes over the treats pretty quickly too.