Intrusive thoughts a sin?

I wanted to ask if it is possible to purposely think of an intrusive thought and then shifting your mind instantly to something else? Is it still an intrusive thought if you have been thinking of it 'purposely' for a second? I dont know how else to explain it, but it felt like I was purposely thinking of it. Anyone else had similar experience what happened during intimate moments like masturbation I feel so ashamed cuz the thoughts are so bad they're either about family members children and stuff like that it feels like I think it I just want to know if I'm not alone I feel like a monster because it feels like I thought these things or like I did think these things and I don't know what to do I feel so ashamed and grossed I need help I just want to know if anyone had a similar experience to shed light on because I don't know I feel so isolated

I am a christian guy who grew up in a christian community and family. For as long as i remember, ive had horrible thoughts about all kinds of things that i dont know where to begin. Due to my extreme thoughts, i feel as if i am unworthy of practicing my religioin, such as praying, reading, meditating, etc. I feel ashamed when i go to church, as if i dont belong there because i feel like i am secretely evil, and that God knows i am evil and i am committing blasphemy by going there, and refusing to "repent", from my thoughts. But then again, my thoughts are just thoughts, sure. So whats the problem? - The problem is that in my faith, i have been taught that we must control our thoughts, so they do not get power over us to make us commit sin. Such as "If you think lustfully about a woman, you have already committed adultery with her in your heart". This verse has killed my self esteem, due to the constant unwanted sexual and disturbing thoughts. It makes me feel like a monster, who secretely just wants to abuse and be horrible to people, even though i know very well i do not want this. Sometimes i think horrible things about the people i love very much, such as my girlfriend. It feels so wrong and evil, even though i know it isnt my true will.

I have intrusive thoughts about God. But sometimes it seems like I do think them myself. I don't agree with them. But it's like I get too exhausted to fight anymore, or when my mind calms down, I don't feel right without the thoughts so I think them myself and idk why. I'm pretty sure I'm going to hell.