anyone know why or what the reason when i turn my AC on it smells like mildew or dirty sneakers?? what should i do to get rid of that ?? any help is greatly appreciated!

 

Try clean out the interior air filter, or even check under the hood to see if anything got caught under there. it happend to my brothers car and we just took a bottle of air freshener and sprayed it down the vents. it seemed to make the smell go away

 

Seems like your cabin filter is dirty, and if you haven't even seen it, most likely it's still the original one. You can buy a new filter for about $30, or the resuable blitz filter for about $40 I believe.