Never start to question your life....Who told you that there are no other alternatives? There are so many career options related to medical fields like Biotechnology, Biomedical Engineering,
psychology, microbiology etc. You're not fucked. Your life has just started. Just take a deep breath and start to believe in yourself. You know what you can do anything. You're reliable, and I think your parents are just tensed like you. that's why they are concerned. Don't take it personally. Just tell your parents there are so many career options and tell them confidently that YOU'RE RELIABLE! You can do anything buddy. Never doubt yourself. Best wishes for your future. Go ahead! :)
NEET is a very tough exam. It's not easy to clear.
With that said, it seems like your anxiety about what the future holds is holding you back from focusing and giving it your all.
It may help to begin bely defining this fear.
What would happen if you could not clear it?
What do you think that will say about you?