a) Register a complaint at your nearest cyber crime police station
b) You also have the option to register an online complaint on cybercrime.gov.in      anonymously also.
c) Report about it to the social media account help centre
Social Media Help Centre URLs:https://www.facebook.com/help/ ; https://help.twitter.com/en;https://help.instagram.com/
d) Immediately cut off all contacts with the online predators and inform your parents or elders.

Know about what the law says with regard to this offence?

The act of grooming may include activities that are legal, but later lead to sexual abuse. It can attract section S.354D IPC (in case the perpetrator had been stalking the victim for the purpose of grooming) 67 /67A , under I.T. Amendment Act 2008. POCSO Act, 2012 may also be invoked in such cases.

Remember that Good friends’ don't make you do things that make you feel uncomfortable.