Whenever something stresses you out, just take a moment to think about it. You need to understand that there is not a single problem in this world that cannot be solved. You simply have to make an effort to find the right solution. You need to start concentrating on how and when to resolve the issue instead of panicking.
If something does not go the way you have planned or you start to worry about something, ask yourself if this really is the end of the world. Problems, disappointments and complications are a routine part of life, something that every single human being has to face no matter who or what they are. While stressing over an issue is normal, letting yourself continue to panic instead of working on a solution is where the real trouble starts.
Each time you find a panic attack creeping over, take a deep breath and analyse the trigger closely with the intention of learning something from it. Every challenge is an opportunity to learn something new and become better.
Are you afraid to face your problems? Are your fears becoming more powerful than your confidence? Use your mind to help your confidence prevail over your fears. To try and fail is much better than to have never tried at all. You will be surprised to see what you are capable of once you gather your courage and face your problems and fears with the determination to conquer them at any cost.
If someone criticises you for something, do not let it shatter your confidence. If the criticism was too harsh or mean, you have the right to defend yourself and prove the other person wrong. However, if you are criticised over something on merit, then use it constructively to improve yourself.
Understand that stressing over every single thing will result in wastage of valuable energy, which you can be investing elsewhere. Use your energy to come up with a solution instead of making the problem look more terrifying.