I'm having an issue where every time I have sex, I end up ejaculating within a few seconds, which leaves my partner feeling disappointed. I've been masturbating for the last 10 years, and I'm worried that this might be causing the problem. I'm 27 years old now, and someone mentioned it might be Nara daurbalya, nerves weakness. Could this be true, and what can I do about it? I'm really concerned and would like some advice.