Hello,

It's okay and it's also normal for someone at a young age to be depressed and worry about future.

Best way to decide what to want to do in future would be researching well. Start seeing relevant YouTube channels or take guidance from someone who has accomplished something in life.

Alright then talking about Bank exams these exams main curriculum is same as your studied in your school time.

So try to focus on that. Revise all the books of 10,11 and 12 standard for general questions that will come from these books that is ncert.

Now English is hard but not impossible try to read newspaper, watch movies or clips with subtitles in them.  I know a person who is of different culture and doesn't even know English it's not his native language. But he is now fluent in English because of the drama friends. He learned by words, talking like that.

Now maths is difficult for even me. So for this start from the basic from bodmas to calculas. Try to practice as many sum as you can.

And lastly general awareness would be your strong point if you read books, newspaper and watch news channels.

Try to practice daily even if it's for one hour or thirty minutes. Practice makes the man perfect.

All the best!!!