Do you always carry some fear or the other ? You fear that you might fail in the exam or goof up in the presentation to the management or you will be dumped by your partner or you will simply not succeed !
True, there is always a possibility to fail. Accept this possibility courageously and then face the situation.
You actually build stress by fearing the unknown. Consider all the potential outcomes of the situation you fear and analyze the result of various possibilities.See the worse case scenario and then mentally imagine how you will deal with this. You will find that your fear is not that big deal. It is your own fear that has the potential to create a wrong situation rather than vice-versa.
Think positively and learn to relax and meditate. There are various techniques for relaxation. Practice these techniques regularly and you will see an amazing reduction in your fear and stress levels !