Very confusing problems but commited to 90 days and hopeful

Here is my story. I am hopeful somebody will have advice or a similar experience.

- Age 34, above average fitness, runner, doctors tell me I have no problems and erectile dysfunction must be some sort of temporary issue that will pass.

- Always been able to masturbate endlessly with erections that seemed to last as long as I want them to, until about 2 years ago. I can't seem to stay hard anymore when masturbating and erections just vanish completely if I stand up, which is baffling. I can still orgasm most nights but it takes a lot of effort to get hard enough and its very brief.

- I have been religious most of my life, and I'm NOT having sex with girls. So I'm not having trouble having sex with girls, my problem is that for some reason I can't masturbate anymore like I always have!

I guess I can understand why people might have trouble having sex with girls because they get too conditioned to masturbating to porn, but that's not my problem. I don't understand what's going on if I'm doing what I've been doing practically my whole life, not sure why things would change.

I am willing to try anything. Ideally, I'd like to settle down with a girl in the near future and be able to have a normal sex life. I've got to fix this. I've been working out more than ever and I'm not depressed despite everything. I'm going to try jumping straight to the 90 day challenge.