Of course you are going to be nervous before doing gigs! That is a big step to us musicians!
When practicing the guitar you are usually not in front of a crowd. With that being said, it can be different. Regardless of how much you practice of course it is nerve wracking to go in front of people!
John you mentioned you have 25-30 songs and are wondering if that is enough for open mic night. Yes!!! Like another member said, that is enough for you to have your own set!
Open mic nights usually accommodate 3-4 songs depending on how long they are.
Go for it! Playing a gig is an incredible experience, it allows you the opportunity to get out of your comfort zone and grow as a musician.
Jeff made a great reference to GT Insider and David Gilmour's quote. Mistakes WILL happen and that is okay! We have to make mistakes to learn what we need to work on. Mistakes can be corrected.
Also, sometimes people don't notice mistakes in your playing. A friend of mine played an open mic night and forgot a few chords so he improvised for a few seconds until he remembered. Because he was so confident and unphased nobody had a clue he made a mistake!
Own your performance! You've got this!
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