being the same age as you, and being a girl, i would say she must be interested if shes willing to go to a concert with you, your a good guy, i know that for sure, and im sure she will know that pretty soon, treat her good!(i know you would anyway) dont ever give up a chance to make her feel special..even flirt with her, so she knows your interested..just dont come onto her,she has a boyfriend that might offend her 
(she might like it though hah jkk) lmao well anyways, good luck ivan!
(she might like it though hah jkk) lmao well anyways, good luck ivan!