Is it weird that I literaly ran away in this social situation? Is this a big problem?

I am 18 years old and I am pretty sure I have more anxiety than most people my age. So anyway my bf and I needed to go to the pharmacy and get the morning after pill for the first time and I was so stressed out about going to get it because you need to actually go up to some one and ask for it and I was really embarrassed. I explained to my boyfriend that I was too stressed to ask for it and he did for me but on top of that it was like 50 bucks and we payed with all one dollar bills... After that my boyfriend was trying to get me to buy him smokes because he is only 17 and i was nervous about it but he was kinda forcing me up there because he wants me to get over this fear I have but when I got up there I just stood there infront of the lady all freaked out and silent then I pulled a Napoleon Dynamite and ran away. The lady said "Okay...?????" and then gave me dirty looks. That is the main reason I avoid situations with people that stress me out but that was the first time it had actually happened. Should I be worried about this problem? Do I need help? Has this happened to anyone else?