People want to have sex when the time is right, for them. Not earlier, but just as much not later. When the romance is going really well, and is progressing naturally and healthily, and one person starts to put on the breaks because sex is coming too close, and probably that person is doing it mostly because of the values of others, then that's unpleasant to the other person.
The other person also will have her or his insecurities and may see the artificial slowing down as a rejection.

Then again, the point where you 'get married' differs in society. Most here are from the US, where it is normal for many to marry in your early twenties. Maybe people just marry earlier so they can have sex at exactly the same point in the relationship, but then inside marriage.

As for the OP, people like to help people who want to be helped. You open threads because you want advice. People will give the advice they feel like giving. That sometimes makes it difficult. If all you got was people reenforcing your current ideas and behavior, your life won't change. Do you want change? If so, you need to actively pursuit change.

You got a lot of harsh advice. That must be hard. But was it unfair? I can't say it is.

In the end you need purchasing power. You want traits that are in high demand? That's costly. You want traits that are rare? That's costly. Can you pay for it?