What is the ruling on arousal & ghusl?

I’m kind of embarrassed to ask this but I want to know: Can something that comes from inappropriate thoughts require ghusl? I get those feelings quite often everyday, I try to ignore them but then sometimes when I get the feeling it’s only there for a second and I never know if I have to do ghusl or not. I read that it depends on if we feel pleasure (then it’s maniy) or just desire (then it’s madhiy) but I don’t know which I’m feeling. As for looks, I can’t tell the difference between the discharge.