It is you, but that's not a bad thing. What I mean is that you apparently are on a different level than those around you, so don't sweat it. They will catch up (eventually), so seek out those with whom you do connect, and don't worry about age.
When I was younger, I didn't have many friends who were my own age. Most of my friends were much older. I was more comfortable with them than I was with others closer to my age. It felt weird at first, but it became very normal for me very quickly.
Seek those who are like-minded and age shouldn't mean anything with regards to that. Life rarely brings people into it that are just your age and nothing more. Embrace people outside of what society says you should socialize with only and experience the joy of humanity as a whole.