Is it weird to insert your finger to poop?

Okay, I’ve been doing this since I was in grade 9. I did this because I was anorexic and my digestion system was bad. At the time I was always bloated. I didn’t like the feeling at all. I guess I couldn’t accept the fact it was part of my anorexia. Anyways I am now recovered (5’6, 135lbs) but my embarrassing pooping habit sticked with me. It’s so embarrassing and frustrating because I can’t poop normally as I used to before. I wished I never started this habit. Because one time, my sister came in the washroom when I did it, and was very grossed out. She told me to tell my parents but I’m very scared to tell them because it’s so weird and embarrassing. I told her I will but really I wouldn’t. I don’t like that I do this to myself but it’s the only way for me to poop. I’ve tried miralax, constipation relief tablets, etc and prunes/prune juice. But it doesn’t really help me. Prunes and prune juice do help me but i don’t get all of my poop out. Please I really need help because my sister is concern and she would eventually tell my family about it.