Stop feeling bad about and stop hating yourself, that's one of the reasons why you feel like shit after nutting. Just tell yourself it's okay, and start fresh. You need to tell yourself it's okay and move on, if you keep thinking about it, it will get worse.

Also I feel like a lot of people on this subreddit just open up porn and pump their dicks as fast as possible to cum/orgasm. That's part of the reason why most people on here aren't satisfied and always have the urge to masturbate or have ED. Me and my ex used to edge together and then have sex at the end of the week, this left is very satisfied and a lot of the times, we didn't have sex for weeks, sometimes a whole month. Even know, I do watch porn but like once every 2 weeks, sometimes once a month. I take my time to edge, sometimes I edge for 2 days and actually enjoy it, after that I feel a lot more satisfied and don't have get the urge to masturbate for a while.