Hi Nivas,

Architecture is a stream that purely needs passion and creativity. It is good that you have a decent NATA score. You can either get through TNEA counselling, or through getting management seats. Tamil Nadu has quite a number of Architecture colleges. Though it is tough to get a seat in any one of the Chennai colleges for 68%, you can still try for Coimbatore, Salem, or the southern colleges. 

All The Best.