Hey Abhishek, First of all, you should come down a bit and stop overthinking about your future.

I can clearly understand that you are very disappointed with your Jee score and even your 12th board percentage is not good enough so that you can opt for B.Sc from some good government college.

I would suggest if you really wanna do B.tech than give yourself a chance and again prepare for jee mains. If you ut the efforts in your studies and prepare wholeheartedly than I can assure you that you will definitely succeed.

But if you are bored from the hectic preparation and are not willing to do it any more then you can definitely opt for B.Sc. You can look for government universities that give admissions on the basis of some admission test and not only just the 12th percentage like Dayalbagh institute, Agra.

It solely depends on you that what you are willing to do.

Hope it helps.