Can you tell me which are my wisdom teeth or 12 year old molars?

Best way... ...Ask your dentist. 12yr molars are the 7th tooth back from the midline, wisdom teeth the 8th. Your dentist will be able to tell with a quick look or possibly an x-ray.
Yes, with an xray. Wisdom teeth are generally the last teeth to erupt into the mouth in the very back corners behind the 12 year molars. At your age you may have 2 molars per quadrant or three molars(if wisdom teeth are in).