Re: Is this her reaction to a confident male?
TomInVegas is right,
Trying to be alpha is not alpha, it is insecure. Worrying about if you are coming across as alpha is generally going to be extremely unhelpful to your game. The obsession with being alpha is one of my biggest complaints about the community.
You will be better off making sure you are connecting with the girl and having fun doing it, in a non needy way, which conveys that you have other options if she does not like you.