I wouldn't beat myself up if I were you. The reason why people exaggerate their sexual traumas is because many instances of legitimate sexual abuse get completely invalidated by our society. Our collective consciousness hasn't gone far away from the Dark Ages. As absurd as it sounds, many people still believe that a girl, who reached puberty, was an equal participant in non-violent sexual encounters with a much older man (or woman) and, was, therefore, equally responsible. The idea that "consent" in such encounters is non-existent is still a hard one for many people to wrap their ignorant minds around. No wonder many people would want to change their stories to make others accept that their abuse was real, even though it was real exactly as it happened. No one wants to be seen as being responsible for what happened to them when they were not responsible, and everyone wants compassion and support from others. After all, we are social animals and can't survive without any external social support.

While lying may not have served you best and may not have been fair to those you lied to, I'd try to forgive myself if I were you given how difficult it is in our insane world to tell the truth about anything related to sexual abuse. I don't think you have to make amends to all those you lied to. I mean, it really depends on what kind of relationship you've had with each of those people and what kind of purpose your confession would serve. You are in the only one to decide what you need to do on the case-by-case basis.