Who should I choose?!

I like two of my friends, one is in high school(freshman) and the other is a couple months younger than me. The freshman is taller, and has darker hair. The other one is short, has blond hair and can act like an idiot. I am super calm, which is rare for me, around the freshman, but I'm the exact opposite when I'm around the other one. They both like me back, and I know that for a fact. Please help me!!!!!!