Can you actually train/condition your brain to not be gay?

Like for example, if you constantly make your brain believe that "oh i'm straight i'm straight i'm straight" or something akin to that.Kinda like shock therapy but you're not using electricity and you're talking yourself into being straight.It's kinda like if you're told you're stupid a lot, then you'll start to believe it and you won't do good academically. Or, before you go to bed, if you tell yourself/make yourself think that you will have a lucid dream, you'll have a lucid dream. So this makes me think: If you make yourself think/tell yourself something like "My brain will not be gay" or something like that, will it actually turn straight, or will it just believe that it's straight but once that thinking has been thrown off then the gay underneath has been exposed?