Hey Shubham.

There is nothing to worry about , u will be getting many more ghances to shape ur career 

See the percentile u have scored will help u in no way to take a seat in the good colleges like NITs , IIITs or GFTIs for pursuing ur highr studies in the field of ur interest under btech courses from the JEE MAINS exam as u haven't cleared the min. criteria i.e 75% aggregate in the boards exam. U should be going for state colleges and private institutions for ur btech career. U can also avail direct admission or some concession in the fee structure of the college with the help of JEE MAINS score. 

Hope u got my point. Ask if any query.

Good luck