Do you think she likes me back?

The girl I like sometimes acts like she likes me. She always says "Hey Eric." in a really sweet voice. In gym cl she picked me as her running partner even though I'm not the fastest runner. Whenever she looks at me she smiles. At other times she acts like we are only friends. She is amazing, beautiful, smart, and athletic. I don't know what to do, I've never dated considering I'm 13. Forgetting my age, at school I am known as Darth Vader because I sound like I'm 40 years old. She also acts like she likes another guy named Adam too, which I don't like. If anyone can help please write a response. :)