I entered the grocery store through the exit.
Are you serious? Why would you enter via the exit?
I saw an attractive girl who was also entering through the exit.
I understand you wanted to talk to the girl you thought was attractive, but you shouldn't use the exit as an entrance. You could have bumped into someone who was trying to leave which may have knocked them over. The store may also get mad at you and kick you out if you do it regularly.
I've been doing it for years without a problem. I guess I'm lucky.
It's better that you just go through the entrance door for now on so that you don't get in trouble.