Excitement and nervousness share similar physiological symptoms, so adjusting your mindset can help..
If you like gigging, the next time you feel nervous about it, tell yourself 'I'm not nervous, I'm excited!' and smile while you're saying it.
"even a fake smile — can have a positive impact on mood. Essentially, triggering certain facial muscles by smiling can "trick" your brain into thinking you're happy".
Psychology innit!