Petrified to see her again?

Theres this girl I used to see all the time (she worekd at a store i went to) . I had/have a huge crush on her. problem is, i couldnt tell if she felt the same or what. but i am pretty sure she could tell. i feel like it was obvius or something. Now i feel all low self esteem - ish, wondering how I could have ever thought she would like me. Now I still want to go to that store, so I can purchase things, but everytime I think about going in, I get absoultely petrifried and afrad to run into her ; even though, I think about her all the time. Help?