Help the puppy learn to give dogs space

I have a couple questions so I'm going to be making a few posts.

My first question is how can I help him learn to give older dogs space?

I have a 16 week old puppy. I've had him since he was 8 weeks old. After doing a DNA test, I found out he's 3/4 Australian cattle dog and almost 1/4 Aussie.

He is so different from when my German shepherd mix was a puppy four years ago.

With older dogs he's constantly in their space. With my shepherd it's constantly trying to play and wrestle, or to take anything he has or shows interest in. For other dogs he meets it's trying to play and wrestle, licking their face, chewing on their collar, trying to mount them or humping the air next to them, grabbing their ears, etc.

My shepherd likes to wrestle with him, but not 24/7.

The puppy HAS to have whatever the other dogs have. Doesn't matter if the same thing is laying next to him, he needs what the other dog has, whether it's a chew, a treat, a ball, a toy.

The puppy doesn't take any dog corrections.

If he doesn't get what he wants he screams. I'm not sure how else to describe the ear piercing sounds he lets loose.

I try to distract him with anything else. Sometimes he spends time in his exercise pen to calm down a bit and give the shepherd time away from him. I try to praise him for the things he's doing right and guide him away from the things he shouldn't do but nothing helps.

He kind of knows leave it. We're working on it. He'll sometimes listen to it but often just ignores us. Usually if it's something he really wants.

It's gotten to the point where he now swallows any treats he gets in as big of chunks as he can to try to get more from the shepherd. It doesn't matter if they're separated he still just swallows things as big as a milkbone whole.