You got 490 marks in NEET and your All India rank is around 64431. You are from Tamil Nadu and under OC category. With this score, you have a fair chance to get admission in some government colleges. Some government colleges take students with marks between 450 and 500. You may also get good self financed colleges with this score. You should wait for state counselling and check the seat allotment list.

Here are some helpful links from Career360 for college cutoffs and details

https://www.careers360.com/articles/neet-cut-off-for-government-colleges

https://www.careers360.com/colleges/government-medical-college-ooty

https://www.careers360.com/colleges/stanley-medical-college-chennai

https://www.careers360.com/colleges/madurai-medical-college-madurai