Why do i get over excited sometimes?

Okay so like when im textin or something and my friend tells me something like this guy I really like likes me back then all of a sudden I get excited and I hold my breath and start suckin in air threw my nose if that makes any sense? And I start to make this high pitch squeal and I start shaking for like 5 seconds. I have NOO idea why I do it! But I really want to know like is this some type of over excitment disorder? Or am I just ****** weird? Also im 16 years old