Hello and welcome.
The funny thing is this is actually how many people start here at Ms and with talking about what happened (I certainly did myself).
A lot of people here have had to struggle with believing what happened was their own fault, or that they were responsable for it themselves, either because the situation itself, or another person involved told them this was so, or because it is simply easier as humans to believe we have some choice over what happened to us.
I'm not saying this is absolutely true for you, but this has been other people's experience in the past.
Whatever your story is though, people on this site will be able to here it without judging, and also try and help you deal with it.
From what you say about "being too nice" it sounds as if your already starting to punish yourself and feel ashamed, and those are certainly things which people here will understand and appreciate.
Also though, what you say, how you say it and when is entirely your affair.
Read other people's posts, contribute if you feel you'd like to, and share what you want to share of your own experience.
There are no obligations on this site other than that it exists for you and for others to try and heal from whatever experience.
Oh btw, your english seems fine to me.