JEE Mains pressure management and overthinking help

I am currently in class 10th and I know that I am being to early for this but I can't help myself. I lately overthink about my future JEE Mains as I am not taking JEE Advance also due to this I have been not focussing on class 10th properly and also got sick for some days due to pressure and not even going outside for play

Please tell me what to do 😭 😭 😭 😭 I am thinking to start class 11th now to build basics

Now come my second problem

Which is a great thank to my Youtube feed and the seniors,,,, please tell me is JEE Maths and Physics actually difficult and overwhelming as this leads me to overthink that how will I solve how will I retain what will I do how will I manage

PLEASE SOMEONE HELP ME AND TELL SOMETHING WHICH CAN BE APPLICABLE TO MORE STUDENTS SO I CAN ALSO RELATE WITH IT AND IMPLEMENT

BTW I SCORE 95%+ IN MY SCHOOL AND LOVE PHYSICS AND NOW PEOPLE ARE SAYING MATHS IS DIFFICULT

PHYSICS IS THE THE DIFFICULT

CHEMISTRY IS EASY BUT I TAKE IT AVERAGELY AS I LOVE MATHS AND PHYSICS SOLVING

PLEASE HELP ME GAIN SOME CONFIDENCE AND GIVE ME A SMALL ROADMAP (I REALLY NEED ROADMAP) SO I CAN AVOID OVERTHINKING AND FOCUS ON STUDIES