Is acting a big part of dancing? And why I do I not believe them or him?

I am a hip hop dancer and every day when I wake up something inside me just wants to bust into choreography, I have also acted in alot of things inculding a main role in an all ireland final irish play. i stopped sppech and drama when I was nine I am now 14 coming 15 and a lot of people have said to me "you're an amazing actress" and "I wouldn't be surprised if you were an actress when you are older", but the problem is, is that I thank them and all but something inside me just doesn't believe them and replies back "but I'm not". Why would I do this it brings my confidence down all the time. In dancing when ever we do our group work my teacher praises me and says that I am really good that I'm doing a solo in a competition soon, don't get me wrong I'm delighted but yet again that voice inside me doesn't believe him and turns that positive comment into a negative one. Why do I do that? To show my passion in dancing would it be good or not to use the very little acting skills I have to show everyone how much dancing really means to me? Thanks :)