SRM University, Andhra Pradesh

Majority of the students are North Indians

You will be fine 

No problem.

Based on the most recent and reliable cutoff trends:

The expected closing rank for CSE at SRM-AP (Amaravati) is typically in the 3,500–6,000 range. Even in years where cutoffs relaxed, they did not generally go beyond 6,000 for the general category at this campus.

For main and more sought-after campuses (such as Kattankulathur in Chennai), CSE usually closes much earlier—well within 2,000–9,000.

With a 15,000 rank, you may have options in other branches (like ECE, IT, Mechanical) at SRM-AP or CSE in lower-preference campuses, but pure CSE at SRM-AP is statistically out of reach as per recent years' counseling cutoffs.