Why does everything think I'm flirting?

[Shiva Verde]

I'm 15.

Okay, so me and my female friends met these guys and they were really fun to hang out. To keep in touch we followed each other on Twitter. I wanted to be friends with them, so I tweet with them constantly. You know just random conversation and laughing over silly things. Most of the time I start the convo. Sometimes it's them. Now my friends think I'm such a flirt. My friend secretly hates me because she thinks I'm flirting with all of them! But I swear I have no plans to be romantic with them or whatsoever. I am just trying to be friends, because I have no guy friends. And I never talked about love or romantic stuff about these guys! I just talk to them about guitars, video games, and other guy stuff.

How do I get the message across that I am just being friendly and I'm not flirting?

P.S. I am just a naturally friendly person and I love making new friends.