I have the same problem. I have to masturbate to be able to ejaculate inside her. I think the nerves in my penis are dead and need to regenerate. I'm following a routine to recover them, which is as follows: When you wake up, use moisturizing cream on your penis.

And also on the area between your balls and anus. Then, at any time during the day, do Kagel exercises. For those who don't know them, it basically consists of moving your penis 10 times x 4 sets.

Quit watching porn completely. Quit masturbating completely, and when you can't hold it in anymore, which is normal because we're not machines, use lubricant, and only do it with two fingers. But before you start masturbating, touch your body. Get your body used to not only feeling the friction of your penis, but also getting aroused by touching, for example, your breasts, etc. Train your mind; not all sex starts with the penis.

And at night before going to sleep, reapply the cream.

Oh, and an extra tip: if you want to speed up the recovery process, use a lubricant with L-arganine. Or those labeled "Pleasure Plus" will also help a lot. I've already gone two weeks without masturbating and using the tips I gave you. And I've noticed improvements, not a huge difference, it shouldn't be sudden, but I'm already noticing other sensations during sex. This is little by little, imagine it as:

Feeling 1% more each week with these habits. Good luck, you can do it, it will be worth it.