(ADVERTISING ALERT) this may be dumb but I made a lot of cool monsters

I made terrible races search (thano's race) and see how bad I am at making feats 

To start off, this is pretty overpowered for a feat. Resisting all damage types is already pretty OP, as well as not really fitting with the theme of zombies (radiant and fire damage would be two examples of weaknesses, off the top of my head), but adding 5 Constitution right off the bat? 5 Constitution is something you'd have to spend multiple levels on to obtain, so getting it in one feat is definitely stronger than it should be.

Here are some ideas to make this more balanced:

Instead of resisting all damage types, how about a +1 to AC to show the durability of a zombie? This seems pretty fair, especially for being a walking, constantly decaying corpse.

Maybe your bite or unarmed attack could deal some kind of poison/necrotic damage, or maybe those killed by said attacks reanimate as undead?

Those are just a few ideas. Keep in mind I'm still relatively new to D&D, and that I'm not trying to belittle you, just offering constructive criticism. Also, I might have misunderstood what you're trying to go for. If so, sorry. Thanks for reading all the way through, though, and I'm eager to see what else you have to offer in terms of homebrew.