Well I was in a same situation that you are in a year before.I also felt helpless and lost all the hopes. But then my parents supported me to drop to prepare for the next year and for the boards too and I also made up my mind in that way. I worked hard next year and see I got 94% in boards next year. So I think you have potential to do well as you have scored 149 marks in JEE MAINS so you should drop this year and give boards exam too you can do well. And also like me you have no other options left so this is a good option for you to go on.
BEST OF LUCK!!!!