Hey,

It's okay to feel this way sometimes. It's gives you perception how to move ahead in your life and with what pace. 21 years is to be very honest no age . You have just started and there is a long way ahead.

It's said age is just a number but trust me when you will achieve what you are targeting for it will seriously become true. There is lot of competition in everything . You just need to calm yourself and keep yourself away from your negative thoughts.

Junior asking suggestions from you is good. At least you will be able to understand where you are lacking and will become capable to cope with it.

Don't give up. Don't loose hope. Trust yourself and don't care about the age. There is no where mentioned that you can't qualify a exam a year or two later.

All the best.

Thank you