Is it normal i once masturbated thinking of my mom while high on cannabis

This happened some 2 1/2 years ago(I was 23y guy), basically I live in India, I had started doing cannabis and it was not something new, I used to hang out with friends and smoke pot, it was a normal thing. After few months passed I tried it alone at my home in my room, I started listening to songs, after some time I really got horny and started watching porn it was like one of the best feelings, felt like it was real and I was present in that place right there, while watching I got so horny I came a cum load I mean it was massif one of the best orgasm I have ever had so far, I felt like I was floating and felt that oneness. I did this often, however one day I got so high and was really unaware of my senses while watching porn I was seeing this woman I started thinking of my mom, I was not able to control that feeling even though I tried my best to come out of it I was not able to change my thoughts and finally I came off thinking of my mom. Right after that I felt so bad and disgusted I felt like crying. I slept through that night, after that I did pot and masturbated on many occasions, it is the best feeling I don't want to deny.
Few months later due to some issues I quit pot and moved on with my life, however lately my conscience keeps telling me that I have done some thing really bad in the past and keeps reminding me about this.

I am always good with my parents and a good person, I would never think of my mother like this generally even though I have had few bad dreams about these things like getting close to mom, however this one incident keeps bothering me and I really wanted to confess about this.
I love cannabis even now not against it or anything.
Is this normal??