Am i in an unofficial relationship?

Ok so me and this girl Romy know each other since a little bit more than a year. Were both around 16 years old and girls. We became really good friends real fast. I trust her and she trusts me. We cuddle, we kiss, we "flirt", she lets me be close to her like no one else has ever been allowed to. When we touch, play fight, laugh, when she lays in my arms, sleeps on my chest, when we kiss each other on the head or cheek, when we talk, when we say we love each other, when im with her in a room no one else exists. She looks like me like in the only one alive. We are so close my friends acctualy think we are together. So do you guys think i am in a relationship? Btw me and Romy, we know we look like we are together and stuff. We joke about it. But I think she wouldnt have a problem if we were, since we basically are exept that we dont have the title "girlfriend".... So what do yall think?