Is it normal if a girl is standing beside a guy for the girl to touch the quy if she likes him?

So the other day my class was looking at books at the school library when this girl (I have a crush on her) walks up beside me and started looking at books, she takes a side step closer to me and me trying to be polite I move a step away. Then she takes another step and we are shoulder to shoulder beside each other, touching. I freaked out an was nervous, so I left the scene. The next 2 days I caught her looking at me twice (that makes me wonder how much time she has stared at me).

Is it normal if a girl is standing beside a guy for the girl to touch the quy if she likes him?
Post Opinion