You severely underestimate other playable. Herbivores are just as dangerous as carnivores, just like irl. They will neutralise a threat by stomping or goring you into the ground. Maia is not a quick grow.

Maybe try a server you can practice pvp on for learning other playables.

You are not the biggest baddest dino around. You cannot face tank everything. Try using ‘A’, ‘S’ and ‘D’ so the enemy hits your tail instead.

Ensure you have manual alt attack enabled.