Alright Leonardo,
I know exactly what your going through, I went through it myself for years and in a way I am still going through it. Since I don't believe that as a young woman of god it is my place to teach anybody and since my victory in this area is still fairly new I'm not going to give you anything specific BUT I am going to share with you my testimony and my walk with god as it stands.
I will start with saying that these thoughts started fairly young and though I remember a time when they did not exist(the memory brings tears of joy to my eyes) I could not say exactly when they started only that at first they were "annoying" then they became "frightening" and at the end "eternally condemning". For awhile I walked with such a burden of grief that I often found myself on my knees begging god to at least take away the thoughts since I was already lost. Then it hit me. "I was still fighting these thoughts!" There was still something pushing me, something that was still trying to "drive me" across some invisible barrier that I had not yet crossed. I began truly searching the scriptures and what I found there brought peace and love, not the condemnation I expected to find.
I found out who I was in christ jesus was a very different person from what these "compulsive thoughts" said I was.
I started standing in who these scriptures said I was, who I was in Christ Jesus, and the promises he made to those who are his children. The second I started standing in these scriptures and in the truth the enemy and his thoughts fled from me. Sure, I still have times were I stop standing in perfect faith and submission to god and I will tell you that those are the only times I become a victim to these thoughts. All other times, I am perfectly free and perfectly in love with god. If anything this very struggle has brought me closer to god than I have ever been before.
All I can say Leonardo is PLEASE don't give up hope. I have faith that once you start really digging into the word of god you will find the truth on this matter
(oh and please, find a teacher you can trust, someone who you know has the love of god in their hearts and the good of others at heart)
Sending hopeful prayers your way,
LittleDaughter