My school crush works at my favorite store

I am a 16 year old student girl. A few months back in August this boy started looking at me and making eye contact quite often. Later i started catching feelings too. A few months later i went to my favorite store and saw him standing in the checkout, i still went in. He looked at me and payed attention to me while i was in the store. I went there once or twice a week in a month period time. At store he was nice to me and looked at me, was sometimes standing close by. etc. But i started worrying if what im doing was wrong, maybe he thinks i go there just because of him. He is quite a popular boy at school too. I didnt go there in 3 weeks after that. Now i really have to go there, but im afraid again he will think about some stupid stuff. So im just wondering, should i go there, was me going there often a mistake?