I have been fapping to porn since an early age, and I have pretty much conditioned myself to cum as fast as possible due to the fear of getting caught. A year ago I started my adventure in pickup and have slept with several girls, and despite cumming fast at the beginning, in time I managed to control it and go for long rounds as long as I wished to do so and stopped being excited about the girl.

When watching hardcore porn, I can fap for hours, but when there is a certain position with a pornstar I like, as strange as it may sound, the moment the guy starts penetrating her I go ultra sensible, I literally have to stop wanking or I'd cum in a couple of seconds. My brain is conditioned to prematurely cum in certain situations, and I believe that is also a main cause that may affect my sexual life, especially the part about getting excited under certain circumstances

How do I uncondition my brain?