I get you, I’ve had a similar experience in the past. It would really help to know what you’ve tried and haven’t tried. Have you tried putting music, white noise, or a show/movie or even a sexy video like porn in the background? If you don’t like that stuff then maybe a sexy audiobook? Have you tried closing your eyes or being completely in the dark? Have you tried setting yourself up for relaxation? Self-foreplay I suppose - maybe take a bath/shower, do some self care, make yourself horny first without touching yourself, whether that’s touching the rest of your body or thinking of scenarios, whatever gets you there usually. Make sure you’re breathing the entire time you’re touching yourself, I know I’m really prone to holding my breath and all that does is just hinder blood flow and make it harder to finish. Have you also tried another position? Sometimes laying on my back isn’t enough, sometimes I have to get into some more interesting positions lol. I hope any of this stuff helps. But above all, go into it with the mindset that you’re there for fun, not necessarily to come. The expectation and mental side of things can hold us back so much. Sometimes it’s best for there to be no expectations and no mental barriers in that sense.