Hello,

First of all you should calm yourself because you are just 21 and a lot is left for you to do.
The phase in which you are going through is something every student faces at some point in their life. You should be happy that you have realized your mistake.

Mistake is when something is done once, and learned upon... If repeated consistently, its a Habit; a Failure is nothing more than a habitual mistake!!

You are just 21, and you have plenty of time to crack SBI PO examination. Just get out of the comfort zone and put the grinding with 8-10 hours a day.
SBI will probably conduct next exam in april or may next year so you you have 6 months almost and that is enough for preparation. Give your everything in these 6 months and trust me you will crack it
Just believe in yourself and try to be better version of yourself. Forget what happened in past and be in present.

Goodluck.

Hello aspirant

It's never late. Don't loose hope. Your whole life is ahead . Your determination power will let you acheive your goals. Start a fresh and forget past. 21 years age is not too late , in fact you have awakened on time.

Be prepared for struggles , aim and decide one track and focus on your dream. You will definitely get your dreams come true. It's time to show your passion nit through words but through your action.

All the best for your future life