Hey Annie,
I have lived with these thoughts since I was thirteen, I am now fiftytwo. I still think about them dailey but have learned thru three years of therapy to address the thoughts everymorning and let them know that they are not going to control me. I sort of lock them away in the back of my mind for the day and try to have atleast one positive thought to help reinforce this.
This forum is a safe place, but unfortunately like the old saying goes there is always one bad apple in every barrel. I think that person who made the remark to you was way out of line.
Maybe you shouldn't give up on therapy so easy. I feel that way occasionally, and have taken this month off from it so I could just work on my thoughts myself. It's o.k. to take a brake from it but you should go back.
Think about what I said about addressing the SI thoughts every morning and tell them nope it's not happening today. Take Care!!~Joseph~