When I was 16, I sold weed and made a 13 year old girl do a bit of what she had gotten for free with me so that I could bypass the fear of hitting on her

As the title. I was the type of guy who never had luck with girls and would get rejected by most of them. I sold weed and I remember a girl coming to my door who was a friend of mine. She was a year older than me. She asked me if I sold weed and I showed her my weed. After a while she asked me for a bit so that we could smoke it together. At first I wanted to decline but I thought that if I got her high enough maybe she would be down. After a while we did do it. A couple of months later a girl she knew came to my door. She was a year younger than me and was 13. She bought a bit of weed from me and I gave her the same offer I had accepted earlier. I remember there being a couple more girls who also did the same thing. I never did this to anyone other than them but the memory of the first girl has made me feel like shit for a long time. I never did it on purpose but it still bothers me to this day