What do I do I am flying on southwest airlines and I am 14 years old?

I will be going from Burbank to San Francisco. Do I still count as a under aged minor or do I fly like a normal person. Answers with extra info will be appreciated. Can I go through security,go to the gate, and get on the plane by myself or does someone have to be with me. What Identification do I need to show that I am 14 and am over the under aged minor rule?