I want some advice on how to prolong intercourse so that I finish more slowly. I've tried everything, but it doesn't work, I'm not 15-16, I'm a lot older and I feel a little uncomfortable.
In time you will recover, you are still young.
Try to concentrate on something else as you get closer to the end. Think for a second about something other than how much you enjoy it and maybe you can prolong your ejaculation.
Circumcise
1 LumenBright answered
Sex shops offer various sprays, gels, etc. If it is mentally based, seek medical advice. There are also special condoms that squeeze the base so they slow down the process of ejaculation, etc. A man went through this problem ....