Hello Prisha

As you have compartment in Mathematics and you wish to change your stream to Humanities you have 2 options from here on:

1. You could try to study and clear your compartment of Mathematics.

2. You can change your stream to Humanities but you will need to repeat from Class 11th so you will need 2 years from now to clear Class 12th.

My personal suggestion will be to choose Option 1. Trust me I have dealt with this feeling myself and wanted to choose Option 2 but I worked hard and cleared my exams. I was scared not only in Mathematics but Physics, Chemistry and even Computer Science.
At last, it's on you what you want to choose.

Thank You!