Granted. You are now undamagable, unhurtable, unkillable. The greatest fall doesn't even scratch you. The deadliest blows tickles. The cruelest war doesn't affect you. People become afraid of your invulnerability as they can not even hope to flinch you.
As years goes by, people start challenging you through your only weakness - your mental state. They feel it's necessary to keep you at bay because you are an entity considered dangerous. They feel that you can possibly turn against them or that you can become an invicible biological weapon at any given moment. They demoralize you by hurling insults at you. They start isolating you whenever they see you. No one wants to communicate with you. Worst of all, assassins are sent to murder every single person you consider dear to you. You desire revenge but you are utterly useless because you are only invulnerable. They can't physically hurt you but you can't physically hurt them too because you are weak in terms of offensive capabilities. They have armour and firepower to fend you off. You can try all you want but you can never hurt them through their steel and bulletproof vests or even fireproof vests in case you get hold of any their weapons. The world is against you. In time, you become severely depressed due to the emotional sufferings you have to face in your daily life. There is not a moment peace. It's just either loneliness or hatred. After much thinking of the meaning of your own damned existance, you decide to take away your own life by attempting suicide. However, no matter what you try, you can never kill yourself.
Ultimately, you become miserable to the point of insanity as you spend the rest of your life until age grants you your new wish.
Ok, I should calm the hell down since it's 3 am but your wish really encourages thinking unless I completely missed out a simple wish corruption.. or maybe I elaborate way too much.
I wish for my midnight cravings for food to go away. (I'm underweight btw, screw teenage hormones).