After the stick/disbelief the OP got at the start of the thread I'm almost hesitant to chime in myself, but to me it sounds like OP's issue is something I suffer from myself, namely stress-based delayed ejaculation / male inorgasmia.
Erectile dysfunction and premature ejaculation get discussed a lot (and there's an entire, very profitable, line of pharmaceuticals to address them) but the other side of the coin, achieving erection but not ejaculation, is much less well understood.
My advice to OP would be thus:
- Seek professional sex therapy if there's some deep rooted sexual issue or hang-up at play
- Keep seeking out sexual experiences to take the fear of the unknown away, men need both arousal and relaxation to perform sexually
- Ease yourself into it by getting a happy ending massage first, then when you start proper punting see how you get on with receiving HJ/BJ rather than going straight for vaginal
- Reset how you respond to stimuli by cutting back on both porn and masturbation, and if you must masturbate, try to do it with a Fleshlight or similar to get accustomed to cumming to hip thrusting rather than wrist action
- Consciously reduce tension at the point you feel you should be climaxing - read up on reverse kegels for men
- If you find you're too stressed or "in your own head" a little pre-sex alcohol can help (not pints and pints, just enough to take the edge off), Cialis is also said to have benefits
Mostly, just keep plugging away and remember any skill can be improved with purposeful practice, and also that improvement isn't always linear. And, of all the things to learn from scratch, this is a pretty pleasant subject to be a student of! Happy punting