The adrenaline is your body's natural drug that, in moderation, makes you sharp, creative, and quick. It creates the feeling of excitement and exhilaration that comes from trying something new. Recognize that it also can be scary and stressful. Some stress is useful. Too much can be harmful.
Some stress provides energy.
Too much stress causes distress and can lead to burnout if done to extreme. Because that's where growth takes place. Just like a muscle gets stronger when we exercise it outside its normal range of use, we get stronger when we get out of our rut. And just like our muscles, once we stretch beyond our current capabilities, we don't ever go back to our original dimensions. As we try new things, we gain confidence.