I want more excitement in my life! How do I do that?

I'm 13 and I love to write stories and stuff on Wattpad. It's basically all I do. Whenever I go outside or sit in my room, I always feel like I have this bottled up energy that I need to release. I like running and I am always first in long distance at school. I have good stamina. Running is the only time when I get this really strong adrenaline rush. I spend most of my time at lunch and breaktimes inside with my friends but really, I want to do something. I want to run and I don't want to stop. The only thing is, I don't want to ditch my friends and running on my own kinda makes me look a little weird at school. Please help me!
I want more excitement in my life! How do I do that?
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